Accession Number
DB00916  (APRD00631)
Small Molecule

Metronidazole is a commonly used antibiotic, belonging to the nitroimidazole class of antibiotics.14 It is frequently used to treat gastrointestinal infections as well as trichomoniasis and giardiasis, and amebiasis which are parasitic infections.4 Metronidazole has been used as an antibiotic for several decades15, with added antiparasitic properties that set it apart from many other antibacterial drugs, allowing it to treat a wide variety of infections. It is available in capsule form, tablet form, and topical form, and suppository preparations for the treatment of various infections.

  • 1-(2-hydroxy-1-ethyl)-2-methyl-5-nitroimidazole
  • 1-(2-hydroxyethyl)-2-methyl-5-nitroimidazole
  • 1-(β-ethylol)-2-methyl-5-nitro-3-azapyrrole
  • 1-(β-hydroxyethyl)-2-methyl-5-nitroimidazole
  • 1-(β-oxyethyl)-2-methyl-5-nitroimidazole
  • 2-methyl-1-(2-hydroxyethyl)-5-nitroimidazole
  • 2-methyl-3-(2-hydroxyethyl)-4-nitroimidazole
  • 2-methyl-5-nitroimidazole-1-ethanol
  • Metronidazol
  • Métronidazole
  • Metronidazole
  • Metronidazolum
External IDs
Bayer 5360 / BAYER-5360 / NSC-50364 / NSC-69587 / RP 8823 / RP-8823
Product Ingredients
IngredientUNIICASInChI Key
Metronidazole hydrochloride76JC1633UF69198-10-3FPTPAIQTXYFGJC-UHFFFAOYSA-N
Product Images
Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing End
FlagylCream10 %VaginalSanofi Aventis1970-12-31Not applicableCanada
FlagylCapsule375 mg/1OralPhysicians Total Care, Inc.1995-05-032000-09-19Us
FlagylCapsule375 mg/1OralG.D. Searle LLC Division of Pfizer Inc1995-05-03Not applicableUs
FlagylCapsule500 mgOralOdan Laboratories Ltd1979-12-31Not applicableCanada
FlagylTablet, film coated500 mg/1OralG.D. Searle LLC Division of Pfizer Inc1963-07-18Not applicableUs
FlagylTablet, film coated250 mg/1OralG.D. Searle LLC Division of Pfizer Inc1963-07-18Not applicableUs
Flagyl 500 500mgSuppositoryVaginalAventis Pharma Ltd.1960-12-312003-07-22Canada
Flagyl ERTablet, film coated, extended release750 mg/1OralG.D. Searle LLC Division of Pfizer Inc1997-11-262014-10-31Us
Florazole ERTablet, extended releaseOralFerring Pharmaceuticals2002-10-102012-09-30Canada
MetroCreamCream7.5 mg/1gTopicalGalderma1995-09-20Not applicableUs
Additional Data Available
  • Application Number
    Application Number

    A unique ID assigned by the FDA when a product is submitted for approval by the labeller.

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  • Product Code
    Product Code

    A governmentally-recognized ID which uniquely identifies the product within its regulatory market.

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Generic Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing End
Apo-metronidazoleCapsuleOralApotex CorporationNot applicableNot applicableCanada
Apo-metronidazoleTabletOralApotex CorporationNot applicableNot applicableCanada
Apo-metronidazoleCapsuleOralApotex Corporation2003-11-27Not applicableCanada
Auro-metronidazoleCapsuleOralAuro Pharma Inc2018-04-03Not applicableCanada
Mar-metronidazoleCapsuleOralMarcan Pharmaceuticals IncNot applicableNot applicableCanada
MetronidazoleGel7.5 mg/1gVaginalOceanside Pharmaceuticals2015-04-01Not applicableUs
MetronidazoleTablet, film coated250 mg/1OralA-S Medication Solutions2014-06-01Not applicableUs
MetronidazoleTablet500 mg/1OralViona Pharmaceuticals Inc2019-02-23Not applicableUs
MetronidazoleTablet500 mg/1Oralbryant ranch prepack1990-09-30Not applicableUs
MetronidazoleTablet250 mg/1OralRemedy Repack2012-09-102013-09-10Us
Additional Data Available
  • Application Number
    Application Number

    A unique ID assigned by the FDA when a product is submitted for approval by the labeller.

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  • Product Code
    Product Code

    A governmentally-recognized ID which uniquely identifies the product within its regulatory market.

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Mixture Products
NameIngredientsDosageRouteLabellerMarketing StartMarketing End
Bismuth Subsalicylate/Metronidazole/Tetracycline HydrochlorideMetronidazole (250 mg/1) + Bismuth subsalicylate (262.4 mg/1) + Tetracycline hydrochloride (500 mg/1)OralAilex Pharmaceuticals, Llc2018-11-30Not applicableUs
FlagystatinMetronidazole (500 mg) + Nystatin (100000 unit)SuppositoryVaginalSanofi Aventis1979-12-31Not applicableCanada
FlagystatinMetronidazole (500 mg) + Nystatin (100000 unit)CreamVaginalSanofi Aventis1976-12-312017-08-24Canada
FlagystatinMetronidazole (500 mg) + Nystatin (100000 unit)SuppositoryVaginalAventis Pharma Ltd.1972-12-312004-07-30Canada
HELIDAC TherapyMetronidazole (250 mg/1) + Bismuth subsalicylate (262.4 mg/1) + Tetracycline hydrochloride (500 mg/1)KitOralPrometheus Laboratories1996-08-152014-02-01Us
PyleraMetronidazole (125 mg/1) + Bismuth subcitrate potassium monohydrate (140 mg/1) + Tetracycline hydrochloride (125 mg/1)CapsuleOralPhysicians Total Care, Inc.2010-08-18Not applicableUs
PyleraMetronidazole (125 mg) + Bismuth subcitrate potassium monohydrate (40 mg) + Tetracycline hydrochloride (125 mg)CapsuleOralAptalis Pharma Canada UlcNot applicableNot applicableCanada
PyleraMetronidazole (125 mg/1) + Bismuth subcitrate potassium monohydrate (140 mg/1) + Tetracycline hydrochloride (125 mg/1)CapsuleOralAllergan, Inc.2013-08-01Not applicableUs
PyleraMetronidazole (125 mg/1) + Bismuth subcitrate potassium monohydrate (140 mg/1) + Tetracycline hydrochloride (125 mg/1)CapsuleOralAxcan Pharma US, Inc.2007-05-012011-06-14Us
RosasolMetronidazole (1.0 %) + Avobenzone (2.0 %) + Octinoxate (7.5 %)CreamTopicalGlaxosmithkline Inc2001-03-282014-03-03Canada
Unapproved/Other Products
NameIngredientsDosageRouteLabellerMarketing StartMarketing End
Brimonidine Tartrate 0.25% / Ivermectin 1% / Metronidazole 1% / Niacinamide 4%Metronidazole (1 g/100g) + Brimonidine tartrate (0.25 g/100g) + Ivermectin (1 g/100g) + Nicotinamide (4 g/100g)GelTopicalSincerus Florida, LLC2019-05-16Not applicableUs
Ivermectin 1% / Metronidazole 1%Metronidazole (1 g/100g) + Ivermectin (1 g/100g)GelTopicalSincerus Florida, LLC2019-05-01Not applicableUs
Ivermectin 1% / Metronidazole 1% / Niacinamide 4%Metronidazole (1 g/100g) + Ivermectin (1 g/100g) + Nicotinamide (4 g/100g)GelTopicalSincerus Florida, LLC2019-05-01Not applicableUs
MetronidazoleMetronidazole (250 mg/1)TabletOralNorth Star Rx Llc2016-12-01Not applicableUs
MetronidazoleMetronidazole (500 mg/100mL)Injection, solutionIntravenousBaxter Healthcare Corporation2017-10-052019-10-31Us
MetronidazoleMetronidazole (500 mg/1)TabletOralNorth Star Rx Llc2016-12-01Not applicableUs
Metronidazole 1% / Mupirocin 2%Metronidazole (1 g/100g) + Mupirocin (2 g/100g)OintmentTopicalSincerus Florida, LLC2019-05-15Not applicableUs
Metronidazole 1% / Mupirocin 2%Metronidazole (1 g/100g) + Mupirocin (2 g/100g)OintmentTopicalSincerus Florida, LLC2019-05-15Not applicableUs
Metronidazole 1% / Mupirocin 2% /Metronidazole (1 g/100g) + Mupirocin (2 g/100g)OintmentTopicalSincerus Florida, LLC2019-05-14Not applicableUs
Metronidazole 1% / Niacinamide 4%Metronidazole (1 g/100g) + Nicotinamide (4 g/100g)GelTopicalSincerus Florida, LLC2019-05-16Not applicableUs
International/Other Brands
Anabact (Cambridge Healthcare Supplies) / Arilin / Clont / Deflamon / Efloran / Elyzol / Entizol / Fossyol / Klion / Klont / Metrolyl / Metrotop / Nalox / Nidagel / Novonidazol / Orvagil / Protostat / Takimetol / Trichazole / Trichex / Trichopol / Tricowas B / Trikacide / Trikozol / Vagilen / Vagimid / Vertisal / Zadstat
CAS number
Average: 171.154
Monoisotopic: 171.064391169
Chemical Formula
InChI Key



Metronidazole is indicated for the treatment of confirmed trichomoniasis caused by Trichomonas vaginalis (except for in the first trimester of pregnancy) and the patient's sexual partners, bacterial vaginosis16, certain types of amebiasis, and various anaerobic infections.11 The above anaerobic infections may occur on the skin and skin structures, the abdomen, the heart, reproductive organs, central nervous system, and the respiratory system. Some may also be present in the bloodstream in cases of septicemia. Common infections treated by metronidazole are Bacteroides species infections, Clostridium infections, and Fusobacterium infections, as well as Peptococcus and Peptostreptococcus infections.14

It is also used off-label in the treatment of Crohn's disease and rosacea, as a prophylactic agent after surgery5, and in the treatment of Helicobacter pylori infection.7 It has also been studied in the prevention of preterm births and to treat periodontal disease.1,12

Associated Conditions
Associated Therapies

Metronidazole treats amebiasis, trichomoniasis, and giardiasis, exerting both antibacterial and antiprotozoal activities.16 Metronidazole is an effective treatment for some anaerobic bacterial infections.11 Metronidazole has shown antibacterial activity against the majority of obligate anaerobes, however, during in vitro studies, it does not demonstrate significant action against facultative anaerobes or obligate aerobes.14 The nitro group reduction of metronidazole by anaerobic organisms is likely responsible for the drug's antimicrobial cytotoxic effects, causing DNA strand damage to microbes.5,7

A note on convulsions and neuropathy and carcinogenesis

It is important to be aware of the risk of peripheral neuropathy and convulsions associated with metronidazole, especially at higher doses. If convulsions or numbness of an extremity occur, discontinue the drug immediately.14 Metronidazole has been found to be carcinogenic in mice and rats. The relevance to this effect in humans is unknown. It is advisable to only administer metronidazole when clinically necessary and only for its approved indications.17

Mechanism of action

The exact mechanism of action of metronidazole has not been fully established, however, it is possible that an intermediate in the reduction of metronidazole which is only made by anaerobic bacteria and protozoa, binds deoxyribonucleic acid and electron-transport proteins of organisms, blocking nucleic acid synthesis.14 After administration, metronidazole enters cells by passive diffusion. Following this, ferredoxin or flavodoxin reduce its nitro group to nitro radicals. The redox potential of the electron transport portions of anaerobic or microaerophilic microorganisms renders metronidazole selective to these organisms, which cause nitro group reduction, leading to the production of toxic metabolites. These include N-(2-hydroxyethyl) oxamic acid and acetamide, which may damage DNA of replicating organisms.5

AOxygen-insensitive NADPH nitroreductase
Helicobacter pylori (strain ATCC 700392 / 26695)
UAnaerobic bacterial DNA
UProtozoal DNA
Additional Data Available
Adverse Effects

Comprehensive structured data on known drug adverse effects with statistical prevalence. MedDRA and ICD10 ids are provided for adverse effect conditions and symptoms.

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Additional Data Available

Structured data covering drug contraindications. Each contraindication describes a scenario in which the drug is not to be used. Includes restrictions on co-administration, contraindicated populations, and more.

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Blackbox Warnings

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After the intravenous infusion of a 1.5g dose, peak concentration was reached within 1 hour and was peak level of 30-40 mg/L.16 When a multiple-dose regimen of 500mg three times a day administered intravenously, steady-state concentrations were achieved within about 3 days and peak concentration was measured at 26 mg/L.16 When administered orally in the tablet form, metronidazole is absorbed entirely absorbed, showing a bioavailability of greater than 90%.7 One resource indicates that Cmax after a single oral dose of 500mg metronidazole ranges from 8 to 13 mg/L, with a Tmax of 25 minutes to 4 hours. The AUC following a single 500mg oral dose of metronidazole was 122 ± 10.3 mg/L • h.7

A note on the absorption of topical preparations

Insignificant percutaneous absorption of metronidazole occurs after the application of 1% metronidazole cream topically. Healthy volunteers applied one 100 mg dose of 14C-labelled metronidazole 2% cream to unbroken skin. After 12 hours, metronidazole was not detected in the plasma. Approximately 0.1% to 1% of the administered metronidazole was measured in the urine and feces.16

Volume of distribution

Metronidazole is widely distributed throughout the body5 and various body fluids. They include the bile, saliva, breastmilk, cerebrospinal fluid, and the placenta.16 Steady-state volume distribution of metronidazole in adults ranges from 0.51 to 1.1 L/kg. It attains 60 to 100% of plasma concentrations in various tissues, such as the central nervous system, however, is not measured in high concentrations in the placental tissue.7

Protein binding

Metronidazole is less than 20% bound to plasma proteins.7,16


Metronidazole undergoes hepatic metabolism via hydroxylation, oxidation, and glucuronidation. The metabolism of metronidazole yields 5 metabolites. The hydroxy metabolite, 1-(2-hydroxy-ethyl)-2-hydroxy methyl-5-nitroimidazole, is considered the major active metabolite.7,13 Unchanged metronidazole is found in the plasma along with small amounts of its 2- hydroxymethyl metabolite. Several metabolites of metronidazole are found in the urine. They are primarily a product of side-chain oxidation in addition to glucuronide conjugation. Only 20% of the dose found in the urine is accounted for by unchanged metronidazole.16 The two main oxidative metabolites of metronidazole are hydroxy and acetic acid metabolites.6,9

Route of elimination

Metronidazole and metabolites are 60 to 80% eliminated in the urine, and 6-15% excreted in the feces.7,14

Half life

The elimination half-life of metronidazole is 7.3 ± 1.0 after a single 500mg IV dose in healthy subjects.16 Another resource indicates that the elimination half-life for metronidazole ranges from 6 to 10 hours.7


Dose adjustments may be required in patients with hepatic impairment, as clearance is impaired in these patients.16 The clearance of metronidazole in the kidneys is estimated at 10 mL/min/1.73 m2.14 The total clearance from serum is about 2.1 to 6.4 L/h/kg.7


LD50 information

The oral LD50 of metronidazole in rats is 5000 mg/kg 16

Overdose information

Adverse effects that may be exaggerated with an overdose include peripheral neuropathy, central nervous system toxicity, seizures, disulfiram-like effect (if combined with alcohol) dark urine, a metallic taste in the mouth, nausea, epigastric discomfort, and vertigo, in addition to neutropenia.10,16 There is no specific antidote for metronidazole overdose. Symptomatic and supportive treatment should be employed in addition to the administration of activated charcoal to remove the unabsorbed drug from the gastrointestinal tract. In addition to the above measures, contact the local poison control center for updated information on the management of a metronidazole overdose.16

Affected organisms
  • Bacteria and protozoa
  • Helicobacter pylori
  • Peptoclostridium difficile
Not Available
Pharmacogenomic Effects/ADRs
Not Available


Drug Interactions
This information should not be interpreted without the help of a healthcare provider. If you believe you are experiencing an interaction, contact a healthcare provider immediately. The absence of an interaction does not necessarily mean no interactions exist.
(R)-warfarinThe serum concentration of (R)-warfarin can be increased when it is combined with Metronidazole.
(S)-WarfarinThe serum concentration of (S)-Warfarin can be increased when it is combined with Metronidazole.
4-hydroxycoumarinThe metabolism of 4-hydroxycoumarin can be decreased when combined with Metronidazole.
5-fluorouridineThe serum concentration of 5-fluorouridine can be increased when it is combined with Metronidazole.
7-NitroindazoleThe therapeutic efficacy of 7-Nitroindazole can be decreased when used in combination with Metronidazole.
9-aminocamptothecinThe metabolism of 9-aminocamptothecin can be decreased when combined with Metronidazole.
AbataceptThe metabolism of Metronidazole can be increased when combined with Abatacept.
AbexinostatThe risk or severity of QTc prolongation can be increased when Metronidazole is combined with Abexinostat.
AcalabrutinibThe metabolism of Metronidazole can be decreased when combined with Acalabrutinib.
AcebutololThe risk or severity of QTc prolongation can be increased when Metronidazole is combined with Acebutolol.
Additional Data Available
  • Extended Description
    Extended Description

    Extended description of the mechanism of action and particular properties of each drug interaction.

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  • Severity

    A severity rating for each drug interaction, from minor to major.

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  • Evidence Level
    Evidence Level

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  • Action

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Food Interactions
  • Avoid alcohol.
  • Take with food. Food reduces irritation.


Synthesis Reference
General References
  1. Shennan A, Crawshaw S, Briley A, Hawken J, Seed P, Jones G, Poston L: A randomised controlled trial of metronidazole for the prevention of preterm birth in women positive for cervicovaginal fetal fibronectin: the PREMET Study. BJOG. 2006 Jan;113(1):65-74. [PubMed:16398774]
  2. Williams CS, Woodcock KR: Do ethanol and metronidazole interact to produce a disulfiram-like reaction? Ann Pharmacother. 2000 Feb;34(2):255-7. [PubMed:10676835]
  3. Visapaa JP, Tillonen JS, Kaihovaara PS, Salaspuro MP: Lack of disulfiram-like reaction with metronidazole and ethanol. Ann Pharmacother. 2002 Jun;36(6):971-4. [PubMed:12022894]
  4. Dingsdag SA, Hunter N: Metronidazole: an update on metabolism, structure-cytotoxicity and resistance mechanisms. J Antimicrob Chemother. 2018 Feb 1;73(2):265-279. doi: 10.1093/jac/dkx351. [PubMed:29077920]
  5. Hernandez Ceruelos A, Romero-Quezada LC, Ruvalcaba Ledezma JC, Lopez Contreras L: Therapeutic uses of metronidazole and its side effects: an update. Eur Rev Med Pharmacol Sci. 2019 Jan;23(1):397-401. doi: 10.26355/eurrev_201901_16788. [PubMed:30657582]
  6. Sprandel KA, Schriever CA, Pendland SL, Quinn JP, Gotfried MH, Hackett S, Graham MB, Danziger LH, Rodvold KA: Pharmacokinetics and pharmacodynamics of intravenous levofloxacin at 750 milligrams and various doses of metronidazole in healthy adult subjects. Antimicrob Agents Chemother. 2004 Dec;48(12):4597-605. doi: 10.1128/AAC.48.12.4597-4605.2004. [PubMed:15561831]
  7. Lamp KC, Freeman CD, Klutman NE, Lacy MK: Pharmacokinetics and pharmacodynamics of the nitroimidazole antimicrobials. Clin Pharmacokinet. 1999 May;36(5):353-73. doi: 10.2165/00003088-199936050-00004. [PubMed:10384859]
  8. Morales-Leon F, von Plessing-Rossel C, Villa-Zapata L, Fernandez-Rocca P, Sanhueza-Sanhueza C, Bello-Toledo H, Mella-Montecinos S: [Pharmacokinetics/pharmacodinamic (PK/PD) evaluation of a short course of oral administration of metronidazole for the management of infections caused by Bacteroides fragilis]. Rev Chilena Infectol. 2015 Apr;32(2):135-41. doi: 10.4067/S0716-10182015000300001. [PubMed:26065445]
  9. Lau AH, Lam NP, Piscitelli SC, Wilkes L, Danziger LH: Clinical pharmacokinetics of metronidazole and other nitroimidazole anti-infectives. Clin Pharmacokinet. 1992 Nov;23(5):328-64. doi: 10.2165/00003088-199223050-00002. [PubMed:1478003]
  10. Kapoor K, Chandra M, Nag D, Paliwal JK, Gupta RC, Saxena RC: Evaluation of metronidazole toxicity: a prospective study. Int J Clin Pharmacol Res. 1999;19(3):83-8. [PubMed:10761537]
  11. Lofmark S, Edlund C, Nord CE: Metronidazole is still the drug of choice for treatment of anaerobic infections. Clin Infect Dis. 2010 Jan 1;50 Suppl 1:S16-23. doi: 10.1086/647939. [PubMed:20067388]
  12. Loesche WJ, Schmidt E, Smith BA, Morrison EC, Caffesse R, Hujoel PP: Effects of metronidazole on periodontal treatment needs. J Periodontol. 1991 Apr;62(4):247-57. doi: 10.1902/jop.1991.62.4.247. [PubMed:2037955]
  13. Pearce RE, Cohen-Wolkowiez M, Sampson MR, Kearns GL: The role of human cytochrome P450 enzymes in the formation of 2-hydroxymetronidazole: CYP2A6 is the high affinity (low Km) catalyst. Drug Metab Dispos. 2013 Sep;41(9):1686-94. doi: 10.1124/dmd.113.052548. Epub 2013 Jun 27. [PubMed:23813797]
  14. Flagyl (Metronidazole) FDA Label [Link]
  15. FDA approvals, Metronidazole [Link]
  16. Canadian monograph, Flagyl [Link]
  17. Flagyl [Link]
External Links
Human Metabolome Database
KEGG Compound
PubChem Compound
PubChem Substance
Therapeutic Targets Database
PDBe Ligand
RxList Drug Page Drug Page
ATC Codes
A02BD11 — Pantoprazole, amoxicillin, clarithromycin and metronidazoleA02BD02 — Lansoprazole, tetracycline and metronidazoleD06BX01 — MetronidazoleA02BD03 — Lansoprazole, amoxicillin and metronidazoleJ01XD01 — MetronidazoleG01AF01 — MetronidazoleJ01RA04 — Spiramycin and metronidazoleA02BD01 — Omeprazole, amoxicillin and metronidazoleP01AB51 — Metronidazole, combinationsJ01RA03 — Cefuroxime and metronidazoleA02BD08 — Bismuth subcitrate, tetracycline and metronidazoleA01AB17 — MetronidazoleP01AB01 — MetronidazoleG01AF20 — Combinations of imidazole derivativesJ01RA10 — Ciprofloxacin and metronidazole
AHFS Codes
  • 84:04.04 — Antibiotics
  • 08:30.92 — Miscellaneous Antiprotozoals
  • 84:04.92 — Miscellaneous Local Anti-infectives
PDB Entries
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Clinical Trials

Clinical Trials
0CompletedTreatmentVaginal Inflammation1
0CompletedTreatmentAcute, uncomplicated Appendicitis1
0Enrolling by InvitationBasic ScienceDietary Modifications / Nutrition1
0Not Yet RecruitingTreatmentColorectal Cancer Stage II / Colorectal Cancer Stage III1
0RecruitingBasic ScienceBioequivalence1
0RecruitingSupportive CareDiverticulitis / Inflammatory Bowel Diseases (IBD) / Neoplasms, Colorectal / Surgical Site Infections1
0SuspendedTreatmentBacterial Vaginosis (BV)1
0Unknown StatusDiagnosticBacterial Vaginosis (BV)1
1Active Not RecruitingTreatmentPulp Necrosis / Regeneration1
1CompletedNot AvailableBacterial Infections / Injuries, Brain1
1CompletedNot AvailableHIV Prevention1
1CompletedNot AvailableHealthy Volunteers2
1CompletedNot AvailableInfection1
1CompletedNot AvailableTo Determine the Bioequivalence Study Under Fasting1
1CompletedNot AvailableTo Determine the Bioequivalence Study Under Fed1
1CompletedBasic ScienceBacterial Infections1
1CompletedBasic ScienceBacterial Vaginosis (BV) / Human Immunodeficiency Virus (HIV) Infections1
1CompletedBasic ScienceHealthy Volunteers1
1CompletedBasic SciencePerianal Crohns'1
1CompletedTreatmentAcne Rosacea1
1CompletedTreatmentBacterial Infections1
1CompletedTreatmentHealthy Volunteers2
1CompletedTreatmentNecrotizing Enterocolitis / Serious Systemic Infections1
1CompletedTreatmentPeriapical Periodontitis1
1CompletedTreatmentPrimary Sclerosing Cholangitis (PSC)1
1Not Yet RecruitingBasic ScienceBacterial Vaginosis (BV)1
1RecruitingTreatmentBacterial Vaginoses1
1RecruitingTreatmentSurgical Site Infection Rate / Surgical Site Infection Rate in Obese Women Who Have Labored Undergoing Cesarean Section / Surgical Site Infections1
1, 2CompletedNot AvailableBacterial Vaginosis (BV)1
1, 2CompletedTreatmentCentral Serous Chorioretinopathy (CSC)1
1, 2CompletedTreatmentPeriodontitis, Aggressive1
1, 2RecruitingPreventionRecurrent Bacterial Vaginosis1
1, 2TerminatedTreatmentBacterial Vaginosis (BV)1
2Active Not RecruitingTreatmentAcute Severe Colitis / Inflammatory Bowel Diseases (IBD) / Ulcerative Colitis1
2Active Not RecruitingTreatmentMalnutrition1
2CompletedPreventionBacterial Vaginosis (BV)1
2CompletedPreventionBacterial Vaginosis (BV) / Candidiasis / Trichomoniasis1
2CompletedPreventionDry socket syndrome1
2CompletedTreatmentAcne Rosacea1
2CompletedTreatmentAppendicitis perforated1
2CompletedTreatmentBacterial Vaginosis (BV) / Birth Weight / Chorioamnionitis / Premature Births1
2CompletedTreatmentBacterial Vaginosis (BV) / Vaginal Infections1
2CompletedTreatmentChronic Lymphocytic Leukaemia (CLL)1
2CompletedTreatmentClostridium Difficile2
2CompletedTreatmentClostridium Difficile-Associated Diarrhea (CDAD)1
2CompletedTreatmentComplicated Intra-Abdominal Infections2
2CompletedTreatmentComplicated Intra-Abdominal Infections, cIAIs1
2CompletedTreatmentComplicated Intra-Abdominal Infections / Complicated Intra-Abdominal Infections (cIAIs)1
2CompletedTreatmentHospital Acquired Infections / Illness, Critical / Pneumonia / Pyrexia / Systemic Inflammatory Response Syndrome (SIRS)1
2CompletedTreatmentMalignant Lymphomas2
2CompletedTreatmentMulti-Drug Resistant Tuberculosis / Tuberculosis Infection1
2CompletedTreatmentNon-Squamous Non-Small Cell Lung Cancer1
2CompletedTreatmentOral Lichen Planus1
2CompletedTreatmentPelvic Inflammatory Disease (PID)1
2CompletedTreatmentPeriodontal Diseases / Periodontitis2
2CompletedTreatmentPeriodontitis, Chronic2
2CompletedTreatmentRosacea Subtype 1 (Erythematotelangiectatic)1
2CompletedTreatmentTrichomonas Vaginitis1
2Not Yet RecruitingPreventionLeaks, Anastomotic / Rectal Carcinoma1
2Not Yet RecruitingTreatmentAppendicitis Acute1
2Not Yet RecruitingTreatmentCrohn's Disease (CD) / Pediatric Crohns Disease1
2Not Yet RecruitingTreatmentPilonidal Sinus1
2Not Yet RecruitingTreatmentUlcerative Colitis1
2RecruitingTreatmentComplicated Intra-Abdominal Infections1
2RecruitingTreatmentGastric Diffuse Large B-cell Lymphoma1
2RecruitingTreatmentInfected Immature Permanent Teeth1
2RecruitingTreatmentRight-sided Colon Adenoma / Right-sided Colon Cancer1
2RecruitingTreatmentUlcerative Colitis1
2TerminatedTreatmentBacterial Vaginosis (BV)1
2TerminatedTreatmentCrohn's Disease (CD)1
2Unknown StatusTreatmentHepatic Encephalopathy (HE)1
2, 3Active Not RecruitingTreatmentClostridium Difficile Infection (CDI)1
2, 3CompletedTreatmentAggressive Periodontitis, Generalized1
2, 3CompletedTreatmentBacterial Vaginosis (BV)1
2, 3CompletedTreatmentCervix Carcinoma1
2, 3CompletedTreatmentChronic Functional Diarrhea1
2, 3CompletedTreatmentComplicated Intra Abdominal Infections / Complicated Intra-Abdominal Infections1
2, 3CompletedTreatmentHemorrhoidectomy1
2, 3CompletedTreatmentPeriodontitis, Aggressive1
2, 3Enrolling by InvitationPreventionPeriodontitis, Chronic / Type 2 Diabetes Mellitus1
2, 3Not Yet RecruitingPreventionSurgical Site Infections / Venous Thromboembolism1
2, 3Not Yet RecruitingTreatmentClostridium Difficile Infection (CDI)1
2, 3Not Yet RecruitingTreatmentHemorrhoid Pain / Hemorrhoids1
2, 3RecruitingPreventionEmergency Cesarean Section / Infection Wound / Wound Infections1
2, 3RecruitingTreatmentAppendicitis Acute1
2, 3RecruitingTreatmentClostridium Difficile1
2, 3RecruitingTreatmentCrohn's Disease (CD)1
2, 3Unknown StatusTreatmentBacterial Vaginosis (BV)1
2, 3Unknown StatusTreatmentBacterial Vaginosis (BV) / Diarrhea / Human Immunodeficiency Virus (HIV) Infections1
2, 3Unknown StatusTreatmentDuodenal Ulcer / Gastric Ulcer / Gastritis / Helicobacter Infections1
3Active Not RecruitingPreventionRecurrent Bacterial Vaginosis1
3Active Not RecruitingTreatmentRectal Carcinoma1
3CompletedPreventionAppendicitis Acute / Perforated Gastroduodenal Ulcer / Small intestinal obstruction1
3CompletedPreventionBacterial Vaginosis (BV)2
3CompletedPreventionHuman Immunodeficiency Virus (HIV) Infections1
3CompletedPreventionInfection / Surgical Site Infections1
3CompletedPreventionNeoplasms, Colorectal1
3CompletedSupportive CareNeoplasms / Wounds and Injuries1
3CompletedTreatmentAbscess, Intra-Abdominal1
3CompletedTreatmentAntibiotic-Associated Diarrhea / Clostridium Enterocolitis / Pseudomembranous Colitis / Pseudomembranous Enteritis / Pseudomembranous Enterocolitis1
3CompletedTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori)1
3CompletedTreatmentBacterial Vaginosis (BV)2
3CompletedTreatmentBacterial Vaginosis (BV) / Candidiasis / Vaginal Inflammation1
3CompletedTreatmentChronic Blepharitis1
3CompletedTreatmentComplicated Intra-Abdominal Infections4
3CompletedTreatmentComplicated Intra-Abdominal Infections / Complicated Urinary Tract Infection1
3CompletedTreatmentComplicated Intra-Abdominal Infections / Intra-Abdominal Infections1
3CompletedTreatmentCrohn's Disease (CD)2
3CompletedTreatmentDiabetes Mellitus / Periodontal Pocket / Periodontitis1
3CompletedTreatmentFecal Incontinence1
3CompletedTreatmentGastritis Associated With Helicobacter Pylori1
3CompletedTreatmentHelicobacter Infections1
3CompletedTreatmentIntra-Abdominal Infections3
3CompletedTreatmentMalodorous Infected Cutaneous Ulcer1
3CompletedTreatmentOptimization of Second Line Treatment Protocol for H Pylori Eradication1
3CompletedTreatmentPapulopustular Rosacea (PPR)1
3CompletedTreatmentPapulopustular Rosacea (PPR) / Rosacea Subtype 1 (Erythematotelangiectatic)1
3CompletedTreatmentPelvic Inflammatory Disease (PID)1
3CompletedTreatmentSkin Diseases, Bacterial / Skin Diseases, Infectious1
3CompletedTreatmentVaginal Infections2
3Not Yet RecruitingTreatmentAntibiotic Resistance, Bacterial / Antibiotic Toxicity / Severe Malnutrition1
3Not Yet RecruitingTreatmentAntibiotic Resistant Infection / Antibiotic Resistant Strain / Bacterial Infection Due to Helicobacter Pylori (H. Pylori)1
3Not Yet RecruitingTreatmentHepatic abscess1
3RecruitingOtherKidney Stones1
3RecruitingPreventionBacterial Vaginoses / Pregnancy Malaria / Trichomonas Vaginitis1
3RecruitingTreatmentAntibiotic Resistant Infection / Complicated skin infection bacterial / Intra Abdominal Infections / Intra-Abdominal Infections1
3RecruitingTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori)1
3RecruitingTreatmentComplicated Intra-Abdominal Infections1
3RecruitingTreatmentHelicobacter-associated Gastritis1
3TerminatedTreatmentBacterial Vaginosis (BV)1
3Unknown StatusTreatmentBacterial Vaginosis (BV) / Fungal Vaginal Infections1
3Unknown StatusTreatmentMalignant Lymphomas / Non-Hodgkin's Lymphoma (NHL)1
3Unknown StatusTreatmentPost Gastrectomy State1
3Unknown StatusTreatmentPostoperative paralytic ileus1
3WithdrawnTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori)1
3WithdrawnTreatmentCommunity Acquired Bacterial Pneumonia / Complicated Intra-Abdominal Infections2
3WithdrawnTreatmentSexual Active Women / Vaginal Discharge1
4Active Not RecruitingTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori)1
4Active Not RecruitingTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori) / Gastrointestinal Ulcer Haemorrhage1
4Active Not RecruitingTreatmentBlastocystis Hominis Infections1
4Active Not RecruitingTreatmentExacerbation of Ulcerative Colitis / Granulomatous Colitis / Ulcerative Colitis, Active Severe1
4Active Not RecruitingTreatmentPeriodontitis, Chronic2
4CompletedNot AvailablePerforated Appendicitis1
4CompletedPreventionInfection Prophylaxis in Colo Rectal Surgery1
4CompletedPreventionPostoperative Wound Infection1
4CompletedSupportive CareAcne Rosacea1
4CompletedSupportive CareGeneralized Aggressive Periodontitis / Periodontitis, Aggressive1
4CompletedTreatmentAbscess, Intra-Abdominal / Appendicitis / Diverticulitis / Gallbladder Inflammation / Intra-Abdominal Infections / Peritonitis1
4CompletedTreatmentAcne Rosacea2
4CompletedTreatmentAmputation Wound / Wound Infections1
4CompletedTreatmentAppendicitis / Cross Infection / Diverticulitis / Gallbladder Inflammation / Peritonitis1
4CompletedTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori)13
4CompletedTreatmentBacterial Vaginosis (BV)4
4CompletedTreatmentC. Difficile / Diarrhea / Enterocolitis1
4CompletedTreatmentChronic Periodontitis, Generalized1
4CompletedTreatmentClinical and Microbiological Effects / Periodontitis, Chronic1
4CompletedTreatmentComplicated Appendicitis1
4CompletedTreatmentComplicated Intra-Abdominal Infections1
4CompletedTreatmentCrohn's Disease (CD)1
4CompletedTreatmentCure Rate of Helicobacter Pylori Infection1
4CompletedTreatmentDental Pulp Necrosis / Periapical Abscess / Root canal infection1
4CompletedTreatmentDyspepsia / Peptic Ulcer1
4CompletedTreatmentFunctional Dyspepsia / Scarred Peptic Ulcer1
4CompletedTreatmentGeneralized Aggressive Periodontitis1
4CompletedTreatmentHealthy Volunteers1
4CompletedTreatmentHelicobacter Infection1
4CompletedTreatmentHelicobacter Infections3
4CompletedTreatmentHelicobacter Pylori Treatment Failure1
4CompletedTreatmentHuman Immunodeficiency Virus (HIV) Infections / Trichomonas Infections1
4CompletedTreatmentIrritable Bowel Syndrome (IBS)1
4CompletedTreatmentPapulopustular Rosacea (PPR)1
4CompletedTreatmentPelvic Inflammatory Disease (PID)1
4CompletedTreatmentPeptic Ulcer1
4CompletedTreatmentPeri-Implantitis and Peri-implant Mucositis1
4CompletedTreatmentPeri-Implantitis / Periodontal Diseases1
4CompletedTreatmentPeriodontal Pocket1
4CompletedTreatmentPeriodontitis, Chronic2
4CompletedTreatmentPeriodontitis, Chronic / Smoking1
4CompletedTreatmentSclerosis, Progressive Systemic / Small Intestinal Bacterial Overgrowth1
4CompletedTreatmentSkin Manifestations2
4Enrolling by InvitationTreatmentSmall Intestinal Bacterial Overgrowth1
4Not Yet RecruitingTreatmentAntimicrobial Susceptibility Testing / Bacterial Infection Due to Helicobacter Pylori (H. Pylori)1
4Not Yet RecruitingTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori)3
4RecruitingBasic ScienceRabies Human1
4RecruitingPreventionSurgery, Colorectal1
4RecruitingTreatmentAntimicrobial Susceptibility Testing / Bacterial Infection Due to Helicobacter Pylori (H. Pylori)1
4RecruitingTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori)5
4RecruitingTreatmentBacterial Vaginitis1
4RecruitingTreatmentBacterial Vaginosis (BV)3
4RecruitingTreatmentBacterial Vaginosis (BV) / Recurrences1
4RecruitingTreatmentElective Colon Surgery1
4RecruitingTreatmentH. Pylori Associated Phlegmonous Gastritis / H. Pylori Infection, Gastritis, Resistance and Treatment / H.Pylori Gastrointestinal Disease / H.Pylori Infection1
4RecruitingTreatmentHemorrhoids / Postoperative pain1
4RecruitingTreatmentPeriimplantitis / Periodontal Diseases1
4RecruitingTreatmentUlcerative Colitis1
4SuspendedTreatmentMalignant Neoplasm of Pancreas1
4TerminatedPreventionClostridium Difficile Diarrhea1
4TerminatedTreatmentBacterial Vaginosis (BV)1
4TerminatedTreatmentSeptic Abortion1
4Unknown StatusTreatmentAdverse Effects / Digestive System Disorders1
4Unknown StatusTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori)4
4Unknown StatusTreatmentBacterial Vaginosis (BV)1
4Unknown StatusTreatmentCommunity Acquired Pneumonia (CAP)1
4Unknown StatusTreatmentEradication Rate for Helicobacter1
4Unknown StatusTreatmentEradication Rates of the Two Regimens1
4Unknown StatusTreatmentGastritis, Gastric Ulcer, and Duodenal Ulcer1
4Unknown StatusTreatmentHelicobacter Pylori1
4Unknown StatusTreatmentPancreatitis,Acute Necrotizing1
4WithdrawnTreatmentCoronary artery thrombosis / Positive Helicobacter Pylori Serology / Supra-aortic Artery Thrombosis1
4WithdrawnTreatmentHelicobacter Pylori / Iron Deficiency Anemia (IDA) / Iron-Deficiency Anemias1
4WithdrawnTreatmentTreatment of Helicobacter Pylori1
Not AvailableActive Not RecruitingTreatmentAppendicitis1
Not AvailableActive Not RecruitingTreatmentAppendicitis / Complicated Appendicitis / Perforated Appendicitis / Ruptured Appendicitis1
Not AvailableActive Not RecruitingTreatmentPeriodontal Diseases / Periodontitis, Aggressive1
Not AvailableActive Not RecruitingTreatmentPeriodontitis, Chronic1
Not AvailableActive Not RecruitingTreatmentRevascularization1
Not AvailableActive Not RecruitingTreatmentSimple Diverticular Disease1
Not AvailableCompletedNot AvailableAcne Rosacea2
Not AvailableCompletedNot AvailableAntibiotic Resistant Strain / Bacterial Infection Due to Helicobacter Pylori (H. Pylori)1
Not AvailableCompletedNot AvailableAntibiotic-Associated Colitis / Clostridium Enterocolitis / Pseudomembranous Colitis1
Not AvailableCompletedNot AvailableBacterial Vaginosis (BV) / Trichomonal Vaginitis / Vaginal Candidiasis1
Not AvailableCompletedNot AvailableColorectal Cancers / Surgical Site Infections1
Not AvailableCompletedNot AvailableGastric/Duodenal Ulcer, Gastric MALT Lymphoma, Idiopathic Thrombocytopenic Purpura, or H. Pylori Gastritis, and Other1
Not AvailableCompletedNot AvailablePeriodontitis, Chronic1
Not AvailableCompletedBasic ScienceEndotoxaemia1
Not AvailableCompletedBasic ScienceHealthy Volunteers / Sepsis1
Not AvailableCompletedDiagnosticIron Deficiency / Malabsorption1
Not AvailableCompletedOtherFlu caused by Influenza1
Not AvailableCompletedPreventionBacterial Vaginosis (BV)1
Not AvailableCompletedPreventionBacterial Vaginosis (BV) / Vaginal Discharge1
Not AvailableCompletedPreventionFirst Trimester Abortion1
Not AvailableCompletedSupportive CareBacterial Vaginosis (BV)1
Not AvailableCompletedTreatmentAppendicitis / Children1
Not AvailableCompletedTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori)9
Not AvailableCompletedTreatmentBacterial Vaginosis (BV)2
Not AvailableCompletedTreatmentGeneral Surgery / Periodontitis1
Not AvailableCompletedTreatmentPerforated Appendicitis1
Not AvailableCompletedTreatmentPeriodontal Diseases1
Not AvailableCompletedTreatmentPeriodontitis, Chronic / Probiotics1
Not AvailableCompletedTreatmentPeritonsillar Abscess1
Not AvailableCompletedTreatmentUlcerative Colitis1
Not AvailableEnrolling by InvitationBasic ScienceHelminth Infection / Malnutrition / Tuberculosis Infection1
Not AvailableEnrolling by InvitationOtherAppendicitis Acute1
Not AvailableEnrolling by InvitationTreatmentAppendicitis Acute1
Not AvailableEnrolling by InvitationTreatmentChronic Periodontitis Complex1
Not AvailableNot Yet RecruitingNot AvailableBacterial Vaginosis (BV) / Vaginal Flora Imbalance1
Not AvailableNot Yet RecruitingPreventionAbscesses / Cellulitis / Cuff / Hysterectomy / Vaginosis1
Not AvailableNot Yet RecruitingPreventionAppendicitis1
Not AvailableNot Yet RecruitingPreventionColostomy Stoma / Hirschprung's Disease / Ileostomy - Stoma / Inflammatory Bowel Diseases (IBD) / Intestinal Obstruction / Jejunostomy Stoma / Meconium Ileus / NEC1
Not AvailableNot Yet RecruitingPreventionSurgical Site Infections1
Not AvailableNot Yet RecruitingTreatmentAnal abscess / Anal Fistulas1
Not AvailableNot Yet RecruitingTreatmentCoronary Artery Disease / Extracorporeal Circulation; Complications / Postoperative Shock / Systemic Inflammatory Response Syndrome (SIRS)1
Not AvailableNot Yet RecruitingTreatmentPeriodontitis1
Not AvailableNot Yet RecruitingTreatmentPeritonsillar Abscess1
Not AvailableRecruitingNot AvailableLeaks, Anastomotic / Surgical Site Infections1
Not AvailableRecruitingPreventionBowel preparation therapy / Colorectal Cancers / Oral Antibiotics / Postoperative Complications / Surgical Site Infections1
Not AvailableRecruitingPreventionForeskin HIV Susceptibility1
Not AvailableRecruitingPreventionRectal Carcinoma1
Not AvailableRecruitingTreatmentAbnormal Vaginal Flora / Clindamycin Vs Metronidazole / High Risk Pregnancies for Preterm Labor1
Not AvailableRecruitingTreatmentAppendicitis Acute1
Not AvailableRecruitingTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori)2
Not AvailableRecruitingTreatmentHelicobacter Infection2
Not AvailableRecruitingTreatmentHepatitis, Autoimmune / Overlap Syndrome / Primary Sclerosing Cholangitis (PSC)1
Not AvailableRecruitingTreatmentInfection1
Not AvailableTerminatedPreventionLength of Pregnancy Prolongation in Hours1
Not AvailableTerminatedTreatmentAbortions spontaneous / Bacterial Vaginosis (BV) / Infertility1
Not AvailableTerminatedTreatmentBacterial Infection Due to Helicobacter Pylori (H. Pylori)1
Not AvailableTerminatedTreatmentSeptic Abortion1
Not AvailableTerminatedTreatmentUlcerative Colitis1
Not AvailableUnknown StatusNot AvailablePersistence of Infection With Helicobacter Pylori1
Not AvailableUnknown StatusPreventionAppendicitis1
Not AvailableUnknown StatusPreventionSurgical Site Infection in Obese Women Undergoing C-section1
Not AvailableUnknown StatusTreatmentBMI >30 kg/m2 / Periodontal Diseases / Periodontitis1
Not AvailableUnknown StatusTreatmentHelicobacter Infection1
Not AvailableUnknown StatusTreatmentPeriapical Diseases1
Not AvailableWithdrawnDiagnosticC. Difficile Infection1


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Dosage forms
CapsuleOral375 mg/1
CapsuleOral500 mg
CreamVaginal10 %
Tablet, film coated, extended releaseOral750 mg/1
Tablet, extended releaseOral
GelTopical10 mg/1g
GelVaginal7.5 mg/1g
LotionTopical0.75 %
CreamTopical10 mg/1g
CreamTopical7.5 mg/1g
GelTopical7.5 mg/1g
GelVaginal13 mg/1g
Injection, solutionIntravenous500 mg/100mL
LotionTopical7.5 mg/1g
LotionTopical7.5 mg/1mL
PowderNot applicable1 g/1g
SolutionIntravenous500 mg/100mL
TabletOral250 mg
TabletOral250 mg/1
TabletOral500 mg/1
Tablet, coatedOral250 mg/1
Tablet, coatedOral500 1/1
Tablet, film coatedOral500 mg/1
Tablet, film coatedOral250 mg/1
CreamTopical1 %
CreamTopical10 mg/60g
GelTopical65 mg/5g
GelVaginal65 mg/5g
KitTopical7.5 mg/1g
Unit descriptionCostUnit
MetroLotion 0.75% Lotion 59ml Bottle292.66USD bottle
MetroCream 0.75% Cream 45 gm Tube281.09USD tube
Metrogel 1% Gel 60 gm Tube200.93USD tube
Metrogel 1% Kit Box200.93USD box
Metrogel 1% kit193.2USD kit
Noritate 1% Cream 60 gm Tube156.44USD tube
MetroNIDAZOLE 0.75% Lotion 59ml Bottle89.86USD bottle
MetroNIDAZOLE 0.75% Cream 45 gm Tube80.87USD tube
MetroNIDAZOLE 0.75% Gel 45 gm Tube74.0USD tube
MetroNIDAZOLE 0.75% Gel 70 gm Tube68.53USD tube
Flagyl ER 750 mg 24 Hour tablet13.2USD tablet
Flagyl er 750 mg tablet12.7USD tablet
MetroNIDAZOLE 750 mg 24 Hour tablet8.07USD tablet
Flagyl 500 mg tablet6.24USD tablet
Metrocream 0.75% cream5.99USD g
Danazol 200 mg capsule5.63USD capsule
Flagyl 375 mg capsule5.45USD capsule
Metrolotion topical 0.75%4.77USD ml
Metronidazole benz powder4.74USD g
Flagyl 250 mg tablet3.49USD tablet
Danazol 100 mg capsule2.98USD capsule
Noritate 1% cream2.51USD g
Danazol 50 mg capsule1.99USD capsule
Metronidazole powder1.65USD g
Metronidazole 0.75% cream1.34USD g
Metronidazole vaginal 0.75% gl0.94USD g
Metronidazole 500 mg tablet0.72USD tablet
Metrogel 0.75 % Gel0.69USD g
Metrogel 1 % Gel0.63USD g
Noritate 1 % Cream0.58USD g
Rosasol 1 % Cream0.57USD g
Metrocream 0.75 % Cream0.52USD g
Metrolotion 0.75 % Lotion0.52USD g
Metrogel-vaginal 0.75% gel0.51USD g
Vandazole vaginal 0.75% gel0.48USD g
Metronidazole 250 mg tablet0.44USD tablet
Flagyl 10 % Cream0.25USD g
Apo-Metronidazole 250 mg Tablet0.06USD tablet
Flagyl 5 mg/ml0.03USD ml
Metro iv 500 mg/100 ml0.03USD ml
Metronidazole 5 mg/ml0.03USD ml
Metronidazole 500 mg/100 ml0.03USD ml
DrugBank does not sell nor buy drugs. Pricing information is supplied for informational purposes only.
Patent NumberPediatric ExtensionApprovedExpires (estimated)
Additional Data Available
  • Filed On
    Filed On

    The date on which a patent was filed with the relevant government.

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Experimental Properties
melting point (°C)160
boiling point (°C)405.4
Predicted Properties
Water Solubility5.92 mg/mLALOGPS
pKa (Strongest Acidic)15.44ChemAxon
pKa (Strongest Basic)3.09ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count4ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area83.87 Å2ChemAxon
Rotatable Bond Count3ChemAxon
Refractivity41.22 m3·mol-1ChemAxon
Polarizability15.82 Å3ChemAxon
Number of Rings1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterNoChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Predicted ADMET features
Human Intestinal Absorption+0.9805
Blood Brain Barrier+0.9297
Caco-2 permeable-0.5365
P-glycoprotein substrateNon-substrate0.5141
P-glycoprotein inhibitor INon-inhibitor0.8954
P-glycoprotein inhibitor IINon-inhibitor0.8755
Renal organic cation transporterNon-inhibitor0.7762
CYP450 2C9 substrateNon-substrate0.7318
CYP450 2D6 substrateNon-substrate0.8815
CYP450 3A4 substrateNon-substrate0.6767
CYP450 1A2 substrateNon-inhibitor0.9045
CYP450 2C9 inhibitorNon-inhibitor0.9242
CYP450 2D6 inhibitorNon-inhibitor0.9231
CYP450 2C19 inhibitorNon-inhibitor0.9401
CYP450 3A4 inhibitorNon-inhibitor0.9242
CYP450 inhibitory promiscuityLow CYP Inhibitory Promiscuity0.8483
Ames testAMES toxic0.9107
BiodegradationNot ready biodegradable0.5941
Rat acute toxicity2.0422 LD50, mol/kg Not applicable
hERG inhibition (predictor I)Weak inhibitor0.5
hERG inhibition (predictor II)Non-inhibitor0.8272
ADMET data is predicted using admetSAR, a free tool for evaluating chemical ADMET properties. (23092397)


Mass Spec (NIST)
Download (9.68 KB)
SpectrumSpectrum TypeSplash Key
Predicted GC-MS Spectrum - GC-MSPredicted GC-MSNot Available
Mass Spectrum (Electron Ionization)MSsplash10-0ul0-9300000000-2268b08f47fed3f6d263
Predicted MS/MS Spectrum - 10V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 20V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 40V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 10V, Negative (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 20V, Negative (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 40V, Negative (Annotated)Predicted LC-MS/MSNot Available
LC-MS/MS Spectrum - LC-ESI-QTOF , positiveLC-MS/MSsplash10-004i-1900000000-659f2bbb83f8ef5a85d1
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-004i-0900000000-50c7cfe79eb17c4440a8
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-00di-0900000000-b06d808767cc01c0d494
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-00fr-0900000000-e9c07cc448b8fb519022
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-004i-0900000000-8ad03b44aa7557127e34
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-004i-0900000000-ed7ba5c872a6309a31d4
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-004i-2900000000-e0ead4b0eec72b9c44b6
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-004i-5900000000-2da8a7b45537f9063220
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-00di-0900000000-24d94f1704e577b05eb7
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-00fr-0900000000-fbb1c4e8457cd3d799b9
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-004i-0900000000-fd6166313a17f944f530
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-004i-0900000000-5ebb32a580e1f5d00170
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-004i-2900000000-811a6e7e45b7ea1a6184
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-004i-5900000000-082e6de6c0fa3f382d84
LC-MS/MS Spectrum - LC-ESI-ITFT , positiveLC-MS/MSsplash10-004i-0900000000-baf9e195c01d875e77b5
LC-MS/MS Spectrum - LC-ESI-QQ , positiveLC-MS/MSsplash10-00di-0900000000-ec181c008a10dac8040b
LC-MS/MS Spectrum - LC-ESI-QQ , positiveLC-MS/MSsplash10-004i-1900000000-2a218e19a8fadb9c66d6
LC-MS/MS Spectrum - LC-ESI-QQ , positiveLC-MS/MSsplash10-003r-9500000000-ed02acd36b190c189cc9
LC-MS/MS Spectrum - LC-ESI-QQ , positiveLC-MS/MSsplash10-001i-9000000000-71ea79659ccd75c64bef
LC-MS/MS Spectrum - LC-ESI-QQ , positiveLC-MS/MSsplash10-001i-9000000000-3f7795597c6629540426
1H NMR Spectrum1D NMRNot Applicable
13C NMR Spectrum1D NMRNot Applicable


This compound belongs to the class of organic compounds known as nitroimidazoles. These are compounds containing an imidazole ring which bears a nitro group.
Organic compounds
Super Class
Organoheterocyclic compounds
Sub Class
Direct Parent
Alternative Parents
Nitroaromatic compounds / 1,2,5-trisubstituted imidazoles / N-substituted imidazoles / Heteroaromatic compounds / Propargyl-type 1,3-dipolar organic compounds / Organic oxoazanium compounds / Azacyclic compounds / Alkanolamines / Primary alcohols / Organopnictogen compounds
show 3 more
1,2,5-trisubstituted-imidazole / Nitroaromatic compound / Nitroimidazole / Trisubstituted imidazole / N-substituted imidazole / Heteroaromatic compound / Organic nitro compound / C-nitro compound / Alkanolamine / Azacycle
show 15 more
Molecular Framework
Aromatic heteromonocyclic compounds
External Descriptors
C-nitro compound, imidazoles, primary alcohol (CHEBI:6909)


Helicobacter pylori (strain ATCC 700392 / 26695)
Pharmacological action
General Function
Oxidoreductase activity
Specific Function
Reduction of a variety of nitroaromatic compounds using NADPH as source of reducing equivalents; two electrons are transferred (By similarity). Capable of reducing metronidazole; inactive RdxA rend...
Gene Name
Uniprot ID
Uniprot Name
Oxygen-insensitive NADPH nitroreductase
Molecular Weight
24067.775 Da
  1. Sisson G, Jeong JY, Goodwin A, Bryden L, Rossler N, Lim-Morrison S, Raudonikiene A, Berg DE, Hoffman PS: Metronidazole activation is mutagenic and causes DNA fragmentation in Helicobacter pylori and in Escherichia coli containing a cloned H. pylori RdxA(+) (Nitroreductase) gene. J Bacteriol. 2000 Sep;182(18):5091-6. [PubMed:10960092]
  2. Chisholm SA, Owen RJ: Mutations in Helicobacter pylori rdxA gene sequences may not contribute to metronidazole resistance. J Antimicrob Chemother. 2003 Apr;51(4):995-9. Epub 2003 Mar 13. [PubMed:12654749]
  3. Debets-Ossenkopp YJ, Pot RG, van Westerloo DJ, Goodwin A, Vandenbroucke-Grauls CM, Berg DE, Hoffman PS, Kusters JG: Insertion of mini-IS605 and deletion of adjacent sequences in the nitroreductase (rdxA) gene cause metronidazole resistance in Helicobacter pylori NCTC11637. Antimicrob Agents Chemother. 1999 Nov;43(11):2657-62. [PubMed:10543743]
  4. Pisharath H, Parsons MJ: Nitroreductase-mediated cell ablation in transgenic zebrafish embryos. Methods Mol Biol. 2009;546:133-43. doi: 10.1007/978-1-60327-977-2_9. [PubMed:19378102]
2. Anaerobic bacterial DNA
Not Available
Pharmacological action
This group represents the DNA of various anaerobic bacteria as a drug target.
  1. Samuelson J: Why metronidazole is active against both bacteria and parasites. Antimicrob Agents Chemother. 1999 Jul;43(7):1533-41. [PubMed:10390199]
  2. Soule AF, Green SB, Blanchette LM: Clinical efficacy of 12-h metronidazole dosing regimens in patients with anaerobic or mixed anaerobic infections. Ther Adv Infect Dis. 2018 May;5(3):57-62. doi: 10.1177/2049936118766462. Epub 2018 Apr 3. [PubMed:29796265]
  3. Flagyl (Metronidazole) FDA Label [Link]
3. Protozoal DNA
Not Available
Pharmacological action
This group is created to include the DNA of various protozoans.
  1. Uzlikova M, Nohynkova E: The effect of metronidazole on the cell cycle and DNA in metronidazole-susceptible and -resistant Giardia cell lines. Mol Biochem Parasitol. 2014 Dec;198(2):75-81. doi: 10.1016/j.molbiopara.2015.01.005. Epub 2015 Feb 12. [PubMed:25681616]
  2. Nasirudeen AM, Hian YE, Singh M, Tan KS: Metronidazole induces programmed cell death in the protozoan parasite Blastocystis hominis. Microbiology. 2004 Jan;150(Pt 1):33-43. doi: 10.1099/mic.0.26496-0. [PubMed:14702395]
  3. Flagyl (Metronidazole) FDA Label [Link]


Pharmacological action
General Function
Steroid hydroxylase activity
Specific Function
Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally un...
Gene Name
Uniprot ID
Uniprot Name
Cytochrome P450 2C9
Molecular Weight
55627.365 Da
  1. Kudo T, Endo Y, Taguchi R, Yatsu M, Ito K: Metronidazole reduces the expression of cytochrome P450 enzymes in HepaRG cells and cryopreserved human hepatocytes. Xenobiotica. 2015 May;45(5):413-9. doi: 10.3109/00498254.2014.990948. Epub 2014 Dec 3. [PubMed:25470432]
  2. Hersh EV, Moore PA: Three Serious Drug Interactions that Every Dentist Should Know About. Compend Contin Educ Dent. 2015 Jun;36(6):408-13; quiz 414, 416. [PubMed:26053779]
  3. Sychev DA, Ashraf GM, Svistunov AA, Maksimov ML, Tarasov VV, Chubarev VN, Otdelenov VA, Denisenko NP, Barreto GE, Aliev G: The cytochrome P450 isoenzyme and some new opportunities for the prediction of negative drug interaction in vivo. Drug Des Devel Ther. 2018 May 8;12:1147-1156. doi: 10.2147/DDDT.S149069. eCollection 2018. [PubMed:29780235]
  4. CYP table [Link]
Pharmacological action
General Function
Vitamin d3 25-hydroxylase activity
Specific Function
Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It performs a variety of oxidation react...
Gene Name
Uniprot ID
Uniprot Name
Cytochrome P450 3A4
Molecular Weight
57342.67 Da
  1. Kudo T, Endo Y, Taguchi R, Yatsu M, Ito K: Metronidazole reduces the expression of cytochrome P450 enzymes in HepaRG cells and cryopreserved human hepatocytes. Xenobiotica. 2015 May;45(5):413-9. doi: 10.3109/00498254.2014.990948. Epub 2014 Dec 3. [PubMed:25470432]
  2. Michalets EL: Update: clinically significant cytochrome P-450 drug interactions. Pharmacotherapy. 1998 Jan-Feb;18(1):84-112. [PubMed:9469685]
  3. Spina E, Pisani F, Perucca E: Clinically significant pharmacokinetic drug interactions with carbamazepine. An update. Clin Pharmacokinet. 1996 Sep;31(3):198-214. doi: 10.2165/00003088-199631030-00004. [PubMed:8877250]
Pharmacological action
General Function
Steroid hydroxylase activity
Specific Function
Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally un...
Gene Name
Uniprot ID
Uniprot Name
Cytochrome P450 2C8
Molecular Weight
55824.275 Da
  1. Kudo T, Endo Y, Taguchi R, Yatsu M, Ito K: Metronidazole reduces the expression of cytochrome P450 enzymes in HepaRG cells and cryopreserved human hepatocytes. Xenobiotica. 2015 May;45(5):413-9. doi: 10.3109/00498254.2014.990948. Epub 2014 Dec 3. [PubMed:25470432]
Pharmacological action
General Function
Steroid binding
Specific Function
UDPGT is of major importance in the conjugation and subsequent elimination of potentially toxic xenobiotics and endogenous compounds. This isoform glucuronidates bilirubin IX-alpha to form both the...
Gene Name
Uniprot ID
Uniprot Name
UDP-glucuronosyltransferase 1-1
Molecular Weight
59590.91 Da
  1. Williams JA, Hyland R, Jones BC, Smith DA, Hurst S, Goosen TC, Peterkin V, Koup JR, Ball SE: Drug-drug interactions for UDP-glucuronosyltransferase substrates: a pharmacokinetic explanation for typically observed low exposure (AUCi/AUC) ratios. Drug Metab Dispos. 2004 Nov;32(11):1201-8. doi: 10.1124/dmd.104.000794. Epub 2004 Aug 10. [PubMed:15304429]
Pharmacological action
General Function
Steroid hydroxylase activity
Specific Function
Exhibits a high coumarin 7-hydroxylase activity. Can act in the hydroxylation of the anti-cancer drugs cyclophosphamide and ifosphamide. Competent in the metabolic activation of aflatoxin B1. Const...
Gene Name
Uniprot ID
Uniprot Name
Cytochrome P450 2A6
Molecular Weight
56501.005 Da
  1. Pearce RE, Cohen-Wolkowiez M, Sampson MR, Kearns GL: The role of human cytochrome P450 enzymes in the formation of 2-hydroxymetronidazole: CYP2A6 is the high affinity (low Km) catalyst. Drug Metab Dispos. 2013 Sep;41(9):1686-94. doi: 10.1124/dmd.113.052548. Epub 2013 Jun 27. [PubMed:23813797]
Pharmacological action
General Function
Oxygen binding
Specific Function
Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally un...
Gene Name
Uniprot ID
Uniprot Name
Cytochrome P450 3A5
Molecular Weight
57108.065 Da
  1. Pearce RE, Cohen-Wolkowiez M, Sampson MR, Kearns GL: The role of human cytochrome P450 enzymes in the formation of 2-hydroxymetronidazole: CYP2A6 is the high affinity (low Km) catalyst. Drug Metab Dispos. 2013 Sep;41(9):1686-94. doi: 10.1124/dmd.113.052548. Epub 2013 Jun 27. [PubMed:23813797]
Pharmacological action
General Function
Oxygen binding
Specific Function
Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally un...
Gene Name
Uniprot ID
Uniprot Name
Cytochrome P450 3A7
Molecular Weight
57525.03 Da
  1. Pearce RE, Cohen-Wolkowiez M, Sampson MR, Kearns GL: The role of human cytochrome P450 enzymes in the formation of 2-hydroxymetronidazole: CYP2A6 is the high affinity (low Km) catalyst. Drug Metab Dispos. 2013 Sep;41(9):1686-94. doi: 10.1124/dmd.113.052548. Epub 2013 Jun 27. [PubMed:23813797]


Pharmacological action
Curator comments
Evidence regarding this transporter inhibition is conflicting in the literature. Various references have been attached, some of which may provide conflicting evidence.
General Function
Xenobiotic-transporting atpase activity
Specific Function
Energy-dependent efflux pump responsible for decreased drug accumulation in multidrug-resistant cells.
Gene Name
Uniprot ID
Uniprot Name
Multidrug resistance protein 1
Molecular Weight
141477.255 Da
  1. Tan SY, Kan E, Lim WY, Chay G, Law JH, Soo GW, Bukhari NI, Segarra I: Metronidazole leads to enhanced uptake of imatinib in brain, liver and kidney without affecting its plasma pharmacokinetics in mice. J Pharm Pharmacol. 2011 Jul;63(7):918-25. doi: 10.1111/j.2042-7158.2011.01296.x. Epub 2011 May 19. [PubMed:21635257]
  2. Kim KA, Park JY: Effect of metronidazole on the pharmacokinetics of fexofenadine, a P-glycoprotein substrate, in healthy male volunteers. Eur J Clin Pharmacol. 2010 Jul;66(7):721-5. doi: 10.1007/s00228-010-0797-2. Epub 2010 Mar 20. [PubMed:20306185]
  3. Page RL 2nd, Klem PM, Rogers C: Potential elevation of tacrolimus trough concentrations with concomitant metronidazole therapy. Ann Pharmacother. 2005 Jun;39(6):1109-13. doi: 10.1345/aph.1E399. Epub 2005 Apr 26. [PubMed:15855244]

Drug created on June 13, 2005 07:24 / Updated on April 07, 2020 20:19

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