Oxybutynin is an antispasmodic, anticholinergic agent indicated for the treatment of overactive bladder with symptoms of urge urinary incontinence, urgency, and frequency. Oxybutynin relaxes bladder smooth muscle. Oxybutynin exhibits only one-fifth of the anticholinergic activity of atropine on the rabbit detrusor muscle, but four to ten times the antispasmodic activity. Antimuscarinic activity resides predominantly in the R-isomer.
Mode of Action:
Oxybutynin exerts a direct antispasmodic effect on smooth muscle and inhibits the muscarinic action of acetylcholine on smooth muscle. No blocking effects occur at skeletal neuromuscular junctions or autonomic ganglia (antinicotinic effects). By inhibiting particularily the M1 and M2 receptors of the bladder, detrusor activity is markedly decreased.
Hepatic, primarily by CYP3A4
LD50=1220 mg/kg (Orally in rats, Goldenthal)
Tupker RA, Harmsze AM, Deneer VH: Oxybutynin therapy for generalized hyperhidrosis. Arch Dermatol. 2006 Aug;142(8):1065-6. Pubmed Mijnhout GS, Kloosterman H, Simsek S, Strack van Schijndel RJ, Netelenbos JC: Oxybutynin: dry days for patients with hyperhidrosis. Neth J Med. 2006 Oct;64(9):326-8. Pubmed Schollhammer M, Misery L: Treatment of hyperhidrosis with oxybutynin. Arch Dermatol. 2007 Apr;143(4):544-5. Pubmed
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