A drug that has been used in various urinary syndromes and as an antispasmodic. Its therapeutic usefulness and its mechanism of action are not clear. It may have local anesthetic activity and direct relaxing effects on smooth muscle as well as some activity as a muscarinic antagonist. [PubChem]
Flavoxate is a spasmolytic flavone derivative that acts by relaxing the smooth muscle in the urinary tract. Flavoxate is a competitive muscarinic receptor antagonist indicated for the treatment of overactive bladder with symptoms of urge urinary incontinence, urgency, and urinary frequency. Muscarinic receptors play an important role in several major cholin-ergically mediated functions, including contractions of urinary bladder smooth muscle and stimulation of salivary secretion.
Mechanism of action
Flavoxate acts as a direct antagonist at muscarinic acetylcholine receptors in cholinergically innervated organs. Its anticholinergic-parasympatholytic action reduces the tonus of smooth muscle in the bladder, effectively reducing the number of required voids, urge incontinence episodes, urge severity and improving retention, facilitating increased volume per void.
57% of the flavoxate HCl was excreted in the urine within 24 hours.
The oral LD50 for flavoxate HCl in rats is 4273 mg/kg. The oral LD50 for flavoxate HCl in mice is 1837 mg/kg. Symptoms of overdose include convulsions, decreased ability to sweat, (warm, red skin, dry mouth, and increased body temperature), hallucinations, increased heart rate and blood pressure, and mental confusion.
Humans and other mammals
Food may reduce irritation.
Take without regard to meals.
Da Re, P.; U.S. Patent 2,921,070; January 12, 1960; assigned to Recordati-Laboratorio
Farmacologico SPA, Italy.
The muscarinic acetylcholine receptor mediates various cellular responses, including inhibition of adenylate cyclase, breakdown of phosphoinositides and modulation of potassium channels through the action of G proteins. Primary transducing effect is Pi turnover.
The muscarinic acetylcholine receptor mediates various cellular responses, including inhibition of adenylate cyclase, breakdown of phosphoinositides and modulation of potassium channels through the action of G proteins. Primary transducing effect is adenylate cyclase inhibition. Signaling promotes phospholipase C activity, leading to the release of inositol trisphosphate (IP3); this then trigge...
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Drug created on June 13, 2005 07:24 / Updated on July 18, 2017 16:56