Clotrimazole Topical Solution USP, 1%

Clinical summary

Indications and usage Prescription Clotrimazole Topical Solution product is indicated for the topical treatment of candidiasis due to Candida albicans and tinea versicolor due to Malassezia furfur . This formulation is also available as a nonprescription product which is indicated for the topical treatment of the following dermal infections: tinea pedis, tinea cruris, and tinea corporis due to Trichophyton rubrum, Trichophyton mentagrophytes , Epidermophyton fluoccosum , and Microsporum canis . Standard dosing Gently massage sufficient Clotrimazole Topical Solution, USP 1% into the affected and surrounding skin areas twice a day, in the morning and evening. Clinical improvement, with relief of pruritus, usually occurs within the first week of treatment with Clotrimazole Topical Solution, USP 1%. If the patient shows no clinical improvement after 4 weeks of treatment with Clotrimazole Topical Solution, USP 1% the diagnosis should be reviewed. Contraindications Topical antifungal agents are contraindicated in those patients with a history of hypersensitivity to any of the components of the preparation. Key warnings Clotrimazole Topical Solution is not for ophthalmic use. Drug interactions Synergism or antagonism between clotrimazole and nystatin, or amphotericin B, or flucytosine against strains of C. albicans has not been reported. Pregnancy guidance The disposition of 14 C-clotrimazole has been studied in humans and animals. Clotrimazole is very poorly absorbed following dermal application or intravaginal administration to humans. (See CLINICAL PHARMACOLOGY ) In clinical trials, use of vaginally applied clotrimazole in pregnant women in their second and third trimesters has not been associated with ill effects. There are, however, no adequate and well-controlled studies in pregnant women during the first trimester of pregnancy. Studies in pregnant rats with intravaginal doses up to 100 mg/kg have revealed no evidence of harm to the fetus due to clotrimazole. High oral doses of clotrimazole in rats and mice ranging from 50 mg/kg to 120 mg/kg resulted in embryotoxicity (possibly secondary to maternal toxicity), impairment of mating, decreased litter size and number of viable young and decreased pup survival to weaning. However, clotrimazole was not teratogenic in mice, rabbits and rats at oral doses up to 200 mg/kg, 180 mg/kg and 100 mg/kg, respectively. Oral absorption in the rat amounts to approximately 90% of the administered dose. Because animal reproduction studies are not always predictive of human response, this drug should be used only if clearly indicated during the first trimester of pregnancy.