Naftifine Hydrochloride

Clinical summary

Indications and usage 1 INDICATIONS AND USAGE Naftifine hydrochloride gel USP, 2% is indicated for the treatment of interdigital tinea pedis caused by the organisms Trichophyton rubrum , Trichophyton mentagrophytes , and Epidermophyton floccosum . Naftifine Hydrochloride Gel USP, 2% is an allylamine antifungal indicated for the treatment of interdigital tinea pedis caused by the organisms Trichophyton rubrum, Trichophyton mentagrophytes, and Epidermophyton floccosum . ( 1 ) Dosage and administration 2 DOSAGE AND ADMINISTRATION Apply a thin layer of naftifine hydrochloride gel, 2% once daily to the affected areas plus an approximate ½ inch margin of healthy surrounding skin for 2 weeks. For topical use only. Naftifine hydrochloride gel, 2% is not for ophthalmic, oral, or intravaginal use. Apply a thin layer of naftifine hydrochloride gel, 2% once daily to the affected areas plus an approximate ½ inch margin of healthy surrounding skin for 2 weeks. ( 2 ) For topical use only. Naftifine hydrochloride gel, 2% is not for ophthalmic, oral, or intravaginal use. ( 2 ) Warnings and cautions 5 WARNINGS AND PRECAUTIONS If redness or irritation develops with the use of naftifine hydrochloride gel treatment should be discontinued. ( 5.1 ) 5.1 Local Adverse Reactions If irritation or sensitivity develops with the use of naftifine hydrochloride gel, treatment should be discontinued. Pregnancy 8.1 Pregnancy Risk Summary There are no available data on naftifine hydrochloride gel use in pregnant women to evaluate a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes. In animal reproduction studies, no adverse effects on embryofetal development were seen at oral doses administered during the period of organogenesis up to 37 times the maximum recommended human dose (MRHD) in pregnant rats or subcutaneous doses administered during the period of organogenesis up to 4 times the MRHD in pregnant rats or 7 times the MRHD in pregnant rabbits ( see Data ). All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively. Data Animal Data Systemic embryofetal development studies were conducted in rats and rabbits. For the comparison of animal to human doses, the MRHD is set at 4 g 2% gel per day (1.33 mg/kg/day for a 60 kg individual). Oral doses of 30 mg/kg/day, 100 mg/kg/day, and 300 mg/kg/day naftifine hydrochloride were administered during the period of organogenesis to pregnant female rats. No treatment-related effects on embryofetal toxicity were noted at doses up to 300 mg/kg/day (37 times the MRHD based on mg/m 2 comparison). Subcutaneous doses of 10 mg/kg/day and 30 mg/kg/day naftifine hydrochloride were administered during the period of organogenesis to pregnant female rats. No treatment-related effects on embryofetal toxicity were noted at 30 mg/kg/day (4 times the MRHD based on mg/m 2 comparison). Subcutaneous doses of 3 mg/kg/day, 10 mg/kg/day, and 30 mg/kg/day naftifine hydrochloride were administered during the period of organogenesis to pregnant female rabbits. No treatment-related effects on embryofetal toxicity were noted at 30 mg/kg/day (7 times the MRHD based on mg/m 2 comparison). A peri- and post-natal development study was conducted in rats. Oral doses of 30 mg/kg/day, 100 mg/kg/day, and 300 mg/kg/day naftifine hydrochloride were administered to female rats from gestational day 14 to lactation day 21. Reduced body weight gain of females during gestation and of the offspring during lactation was noted at 300 mg/kg/day (37 times the MRHD based on mg/m 2 comparison). No developmental toxicity was noted at 100 mg/kg/day (12 times the MRHD based on mg/m 2 comparison).