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Accession NumberDB00868  (APRD00629)
TypeSmall Molecule

Benzonatate is a non-narcotic oral antitussive (cough suppressant) drug which works by anesthetizing the tissues of the lungs and pleura responsible for the cough reflex. It is chemically related to other ester anesthetics such as procaine. It has an anesthetic (numbing) action similar to that of benzocaine and “numbs” the stretch sensors in the lungs. It is the stretching of these sensors with breathing that causes the cough. It was approved by the FDA in 1958.

2-[2-[2-[2-[2-[2-[2-[2-(2-Methoxyethoxy)ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethyl 4-butylaminobenzoate
2,5,8,11,14,17,20,23,26-Nonaoxaoctacosan-28-yl P-(butylamino)benzoate
3,6,9,12,15,18,21,24,27-Nonaoxaoctacosyl 4-butylaminobenzoate
4-(Butylamino)benzoic acid 3,6,9,12,15,18,21,24,27-nonaoxaoctacos-1-yl ester
Nonaethyleneglycol monomethyl ether P-N-butylaminobenzoate
P-Butylaminobenzoic acid omega-O-methylnonaethyleneglycol ester
External Identifiers
  • KM 65
Approved Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing End
Tessaloncapsule100 mg/1oralPfizer Laboratories1958-02-10Not applicableUs
Approved Generic Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing End
Benzonatatecapsule200 mg/1oralNorthwind Pharmaceuticals2015-01-15Not applicableUs
Benzonatatecapsule200 mg/1oralMikart, Inc.2009-11-09Not applicableUs
Benzonatatecapsule100 mg/1oralAidarex Pharmaceuticals LLC2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralClinical Solutions Wholesale2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralPhysicians Total Care, Inc.2001-04-04Not applicableUs
Benzonatatecapsule200 mg/1oralProficient Rx LP2015-08-10Not applicableUs
Benzonatatecapsule100 mg/1oralStrides Arcolab Limited2015-07-30Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralNorthwind Pharmaceuticals, LLC2015-03-12Not applicableUs
Benzonatatecapsule200 mg/1oralZydus Pharmaceuticals (USA) Inc.2007-09-04Not applicableUs
Benzonatatecapsule200 mg/1oralDIRECT RX2014-01-01Not applicableUs
Benzonatatecapsule100 mg/1oralZydus Pharmaceuticals (USA) Inc.2007-09-04Not applicableUs
Benzonatatecapsule100 mg/1oralGolden State Medical Supply, Inc.2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralRed Pharm Drug Inc.2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralRebel Distributors Corp2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralStrides Arcolab Limited2015-07-30Not applicableUs
Benzonatatecapsule200 mg/1oralMajor Pharmaceuticals Inc2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralKAISER FOUNDATION HOSPITALS2010-06-21Not applicableUs
Benzonatatecapsule200 mg/1oralNorthwind Pharmaceuticals, LLC2014-07-25Not applicableUs
Benzonatatecapsule150 mg/1oralMikart, Inc.2009-11-09Not applicableUs
Benzonatatecapsule100 mg/1oralClinical Solutions Wholesale2007-07-25Not applicableUs
Benzonatatecapsule, liquid filled200 mg/1oralAv Kare, Inc.2016-03-15Not applicableUs
Benzonatatecapsule100 mg/1oralPhysicians Total Care, Inc.1995-12-27Not applicableUs
Benzonatatecapsule100 mg/1oralLife Line Home Care Services, Inc.2012-01-12Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralReady Meds2010-06-04Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralDIRECT RX2015-01-01Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralCarilion Materials Management2010-06-04Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralRed Pharm Drug Inc.2010-01-13Not applicableUs
Benzonatatecapsule100 mg/1oralRebel Distributors Corp2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralMajor Pharmaceuticals Inc2007-07-25Not applicableUs
Benzonatatetablet100 mg/1oralNorthwind Pharmaceuticals, LLC2014-12-08Not applicableUs
Benzonatatecapsule100 mg/1oralMikart, Inc.2009-11-09Not applicableUs
Benzonatatecapsule200 mg/1oralSun Pharmaceutical Industries, Inc.2008-04-07Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralAv Kare, Inc.2016-03-15Not applicableUs
Benzonatatecapsule100 mg/1oralH.J. Harkins Company, Inc.2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralBanner Life Sciences Llc.2015-06-01Not applicableUs
Benzonatatecapsule200 mg/1oralbryant ranch prepack2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralDIRECT RX2015-01-01Not applicableUs
Benzonatatecapsule100 mg/1oralAmerican Health Packaging2011-10-03Not applicableUs
Benzonatatecapsule200 mg/1oralMed Vantx, Inc.2008-01-25Not applicableUs
Benzonatatecapsule100 mg/1oralStat Rx USA2007-07-30Not applicableUs
Benzonatatecapsule100 mg/1oralNcs Health Care Of Ky, Inc Dba Vangard Labs2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralTAGI Pharma, Inc.2015-08-10Not applicableUs
Benzonatatecapsule100 mg/1oralPd Rx Pharmaceuticals, Inc.2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralSun Pharmaceutical Industries, Inc.2008-04-07Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralA S Medication Solutions2010-06-04Not applicableUs
Benzonatatecapsule200 mg/1oralH.J. Harkins Company, Inc.2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralBanner Life Sciences Llc.2015-06-01Not applicableUs
Benzonatatecapsule100 mg/1oralbryant ranch prepack1993-04-01Not applicableUs
Benzonatatecapsule100 mg/1oralDIRECT RX2014-01-01Not applicableUs
Benzonatatecapsule, liquid filled200 mg/1oralMed Vantx, Inc.2010-06-04Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralApotheca Inc.2010-06-04Not applicableUs
Benzonatatecapsule100 mg/1oralNcs Health Care Of Ky, Inc Dba Vangard Labs2007-09-04Not applicableUs
Benzonatatecapsule200 mg/1oralPd Rx Pharmaceuticals, Inc.2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralAvera Mc Kennan Hospital2015-03-05Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralREMEDYREPACK INC.2014-06-16Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralPreferred Pharmaceuticals, Inc.2012-04-05Not applicableUs
Benzonatatecapsule200 mg/1oralProficient Rx LP2008-04-07Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralREMEDYREPACK INC.2014-10-02Not applicableUs
Benzonatatecapsule150 mg/1oralAscend Laboratories LLC2015-02-09Not applicableUs
Benzonatatecapsule200 mg/1oralCadila Healthcare Limited2007-09-04Not applicableUs
Benzonatatecapsule100 mg/1oralBlenheim Pharmacal, Inc.2010-11-01Not applicableUs
Benzonatatecapsule100 mg/1oralNcs Health Care Of Ky, Inc Dba Vangard Labs2010-11-14Not applicableUs
Benzonatatecapsule200 mg/1oralUnit Dose Services2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralPd Rx Pharmaceuticals, Inc.2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralAscend Laboratories LLC2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralCadila Healthcare Limited2007-09-04Not applicableUs
Benzonatatecapsule200 mg/1oralBlenheim Pharmacal, Inc.2013-07-10Not applicableUs
Benzonatatecapsule200 mg/1oralLiberty Pharmaceuticals, Inc.2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralUnit Dose Services2007-07-25Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralRebel Distributors Corp2010-01-13Not applicableUs
Benzonatatecapsule100 mg/1oralPd Rx Pharmaceuticals, Inc.2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralPreferred Pharmaceuticals Inc.2016-03-01Not applicableUs
Benzonatatecapsule100 mg/1oralREMEDYREPACK INC.2013-05-29Not applicableUs
Benzonatatecapsule200 mg/1oralPreferred Pharmaceuticals, Inc.2014-08-01Not applicableUs
Benzonatatecapsule200 mg/1oralProficient Rx LP2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralSt Marys Medical Park Pharmacy2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralLake Erie Medical DBA Quality Care Products LLC2007-07-25Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralLake Erie Medical DBA Quality Care Products LLC2010-06-04Not applicableUs
Benzonatatecapsule100 mg/1oralCardinal Health2010-11-14Not applicableUs
Benzonatatecapsule100 mg/1oralMajor Pharmaceuticals, Inc.2007-09-04Not applicableUs
Benzonatatecapsule100 mg/1oralREMEDYREPACK INC.2013-05-22Not applicableUs
Benzonatatecapsule100 mg/1oralPreferred Pharmaceuticals, Inc.2008-04-07Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralProficient Rx LP2010-06-04Not applicableUs
Benzonatatecapsule100 mg/1oralAmerican Health Packaging2015-06-01Not applicableUs
Benzonatatecapsule100 mg/1oralAscend Laboratories LLC2007-07-25Not applicableUs
Benzonatatecapsule, liquid filled200 mg/1oralAmneal Pharmaceuticals of NY LLC2010-06-04Not applicableUs
Benzonatatecapsule100 mg/1oralBlenheim Pharmacal, Inc.2013-01-14Not applicableUs
Benzonatatecapsule100 mg/1oralLiberty Pharmaceuticals, Inc.2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralLake Erie Medical & Surgical Supply DBA Quality Care Products LLC2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralAidarex Pharmaceuticals LLC2007-07-25Not applicableUs
Benzonatatecapsule100 mg/1oralCardinal Health2007-09-04Not applicableUs
Benzonatatecapsule, gelatin coated200 mg/1oralDIRECT RX2016-02-15Not applicableUs
Benzonatatecapsule, liquid filled200 mg/1oralNorthwind Pharmaceuticals2015-03-12Not applicableUs
Benzonatatecapsule100 mg/1oralPreferred Pharmaceuticlas Inc.2016-01-04Not applicableUs
Benzonatatecapsule100 mg/1oralProficient Rx LP2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralGolden State Medical Supply, Inc.2007-07-25Not applicableUs
Benzonatatecapsule200 mg/1oralRed Pharm Drug Inc.2007-07-25Not applicableUs
Benzonatatecapsule, liquid filled100 mg/1oralAmneal Pharmaceuticals of NY LLC2010-06-04Not applicableUs
Benzonatatecapsule, liquid filled200 mg/1oralMajor Pharmaceuticals2010-06-04Not applicableUs
Benzonatatecapsule100 mg/1oralLiberty Pharmaceuticals, Inc.2007-07-25Not applicableUs
Zonatusscapsule150 mg/1oralVertical Pharmaceuticals, Inc.2011-11-01Not applicableUs
Approved Over the Counter ProductsNot Available
Unapproved/Other Products Not Available
International Brands
Brand mixturesNot Available
SaltsNot Available
CAS number104-31-4
WeightAverage: 603.7419
Monoisotopic: 603.361861543
Chemical FormulaC30H53NO11
2,5,8,11,14,17,20,23,26-nonaoxaoctacosan-28-yl 4-(butylamino)benzoate
DescriptionThis compound belongs to the class of organic compounds known as benzoic acid esters. These are ester derivatives of benzoic acid.
KingdomOrganic compounds
Super ClassBenzenoids
ClassBenzene and substituted derivatives
Sub ClassBenzoic acids and derivatives
Direct ParentBenzoic acid esters
Alternative Parents
  • Benzoate ester
  • Aminobenzoic acid or derivatives
  • Benzylether
  • Phenylalkylamine
  • Substituted aniline
  • Benzoyl
  • Secondary aliphatic/aromatic amine
  • Aniline
  • Carboxylic acid ester
  • Secondary amine
  • Monocarboxylic acid or derivatives
  • Ether
  • Dialkyl ether
  • Carboxylic acid derivative
  • Hydrocarbon derivative
  • Organooxygen compound
  • Organonitrogen compound
  • Carbonyl group
  • Amine
  • Aromatic homomonocyclic compound
Molecular FrameworkAromatic homomonocyclic compounds
External Descriptors
IndicationFor the symptomatic relief of cough. Has also been applied locally in the oral cavity in adults by releasing the drug from the liquid-filled capsules to provide oropharyngeal anesthesia for conscious intubation.
PharmacodynamicsBenzonatate, a non-narcotic antitussive agent chemically related to tetracaine and other ester-type local anesthetics, is used to suppress cough associated with both acute and chronic respiratory conditions. The drug acts peripherally by anesthetizing the stretch receptors located in the respiratory passages, lungs, and pleura through the dampening of their activity, which reduces the cough reflex.
Mechanism of actionBenzonatate acts peripherally, anesthetizing the stretch receptors of vagal afferent fibers in the alveoli of the lungs, bronchi, and pleura. Since these receptors are responsible for mediating the cough reflex, anesthetizing these receptors result in the inhibiton of cough production. Benzonatate also suppresses transmission of the cough reflex at the level of the medulla where the afferent impulse is transmitted to the motor nerves. When applied locally, Benzonatate binds within the intracellular portion of voltage-gated sodium channels, decreasing the rate of membrane depolarization and increasing the threshold for electrical excitability.
Related Articles
AbsorptionNot Available
Volume of distributionNot Available
Protein bindingNot Available

Benzonatate is hydrolyzed to para-aminobenzoic acid (PABA) by plasma esterases

Route of eliminationNot Available
Half life3-8 hours
ClearanceNot Available
ToxicityRestlessness, tremors, seizures and unconsciousness.
Affected organisms
  • Humans and other mammals
PathwaysNot Available
SNP Mediated EffectsNot Available
SNP Mediated Adverse Drug ReactionsNot Available
Predicted ADMET features
Human Intestinal Absorption+0.9932
Blood Brain Barrier+0.9355
Caco-2 permeable+0.6067
P-glycoprotein substrateSubstrate0.6531
P-glycoprotein inhibitor INon-inhibitor0.5978
P-glycoprotein inhibitor IINon-inhibitor0.9434
Renal organic cation transporterNon-inhibitor0.7646
CYP450 2C9 substrateNon-substrate0.875
CYP450 2D6 substrateNon-substrate0.7017
CYP450 3A4 substrateNon-substrate0.6026
CYP450 1A2 substrateNon-inhibitor0.9045
CYP450 2C9 inhibitorNon-inhibitor0.907
CYP450 2D6 inhibitorNon-inhibitor0.9232
CYP450 2C19 inhibitorNon-inhibitor0.9025
CYP450 3A4 inhibitorNon-inhibitor0.9275
CYP450 inhibitory promiscuityLow CYP Inhibitory Promiscuity0.932
Ames testNon AMES toxic0.7269
BiodegradationReady biodegradable0.6331
Rat acute toxicity2.2423 LD50, mol/kg Not applicable
hERG inhibition (predictor I)Weak inhibitor0.9013
hERG inhibition (predictor II)Non-inhibitor0.6129
ADMET data is predicted using admetSAR, a free tool for evaluating chemical ADMET properties. (23092397 )
  • Banner pharmacaps inc
  • Kv pharmaceutical co
  • Mikart inc
  • Orit laboratories llc
  • Sun pharmaceutical industries inc
  • The pharma network llc
  • Zydus pharmaceuticals usa inc
  • Forest laboratories inc
Dosage forms
Capsuleoral150 mg/1
Capsuleoral200 mg/1
Capsule, gelatin coatedoral200 mg/1
Capsule, liquid filledoral100 mg/1
Capsule, liquid filledoral200 mg/1
Tabletoral100 mg/1
Capsuleoral100 mg/1
Unit descriptionCostUnit
Tessalon 200 mg capsule2.76USD capsule
Benzonatate 200 mg capsule2.03USD capsule
Tessalon Perles 100 mg capsule1.62USD capsule
Zonatuss 150 mg capsule1.59USD capsule
Tessalon perle 100 mg capsule1.4USD capsule
Benzonatate 100 mg capsule0.85USD capsule
DrugBank does not sell nor buy drugs. Pricing information is supplied for informational purposes only.
PatentsNot Available
Experimental Properties
water solubilitySoluble in most organic solvents except aliphatic hydrocarbonsNot Available
logP2.45HANSCH,C ET AL. (1995)
Predicted Properties
Water Solubility0.00159 mg/mLALOGPS
pKa (Strongest Basic)3.47ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count11ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area121.4 Å2ChemAxon
Rotatable Bond Count33ChemAxon
Refractivity161.54 m3·mol-1ChemAxon
Polarizability67.87 Å3ChemAxon
Number of Rings1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Mass Spec (NIST)Not Available
SpectraNot Available
Synthesis Reference

Matter, M.; U.S. Patent 2,714,608; August 2, 1955; assigned to Ciba Pharmaceutical Products, Inc.

General References
  1. Cohen V, Jellinek SP, Stansfield L, Truong H, Baseluos C, Marshall JP: Cardiac arrest with residual blindness after overdose of Tessalon(R) (benzonatate) perles. J Emerg Med. 2011 Aug;41(2):166-71. doi: 10.1016/j.jemermed.2009.08.027. Epub 2009 Nov 5. [PubMed:19892505 ]
External Links
ATC CodesR05DB01
AHFS CodesNot Available
PDB EntriesNot Available
FDA labelNot Available
MSDSNot Available
Drug InteractionsNo interactions found.
Food InteractionsNot Available


Pharmacological action
General Function:
Voltage-gated sodium channel activity involved in sa node cell action potential
Specific Function:
This protein mediates the voltage-dependent sodium ion permeability of excitable membranes. Assuming opened or closed conformations in response to the voltage difference across the membrane, the protein forms a sodium-selective channel through which Na(+) ions may pass in accordance with their electrochemical gradient. It is a tetrodotoxin-resistant Na(+) channel isoform. This channel is respon...
Gene Name:
Uniprot ID:
Molecular Weight:
226937.475 Da
  1. Thimann DA, Huang CJ, Goto CS, Feng SY: Benzonatate toxicity in a teenager resulting in coma, seizures, and severe metabolic acidosis. J Pediatr Pharmacol Ther. 2012 Jul;17(3):270-3. doi: 10.5863/1551-6776-17.3.270. [PubMed:23258970 ]
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Drug created on June 13, 2005 07:24 / Updated on March 31, 2014 15:07