Naftin ® Gel, 1% is indicated for the topical treatment of tinea pedis, tinea cruris, and tinea corporis caused by the organisms Trichophyton rubrum, Trichophyton mentagrophytes, Trichophyton tonsurans * Efficacy for this organism in this organ system was studied in fewer than 10 infections. , Epidermophyton floccosum * .
Dosage and administration
A sufficient quantity of Naftin ® Gel, 1% should be gently massaged into the affected and surrounding skin areas twice a day, in the morning and evening. The hands should be washed after application. If no clinical improvement is seen after four weeks of treatment with Naftin ® Gel, 1%, the patient should be re-evaluated.
Naftin
® Gel, 1% contains the synthetic, broad-spectrum, antifungal agent naftifine hydrochloride. Naftin
® Gel, 1% is for topical use only.
CHEMICAL NAME
SPL UNCLASSIFIED SECTION
(E)-N-Cinnamyl-N-methyl-1-naphthalenemethylamine hydrochloride. Naftifine hydrochloride has an empirical formula of C
21H
21N•HCl and a molecular weight of 323.86.
Naftifine Hydrochloride is a synthetic allylamine derivative. The following
in vitro data are available but their clinical significance is unknown. Naftifine hydrochloride has been shown to exhibit fungicidal activity
in vitro against a broad spectrum of organisms, including
Trichophyton rubrum, Trichophyton mentagrophytes, Trichophyton tonsurans, Epidermophyton floccosum, Microsporum canis, Microsporum audouini, and
Microsporum gypseum, and fungistatic activity against
Candida species, including
Candida albicans. Naftin
® Gel, 1% has only been shown to be clinically effective against the disease entities listed in the
INDICATIONS AND USAGE section.
Although the exact mechanism of action against fungi is not known, naftifine hydrochloride appears to interfere with sterol biosynthesis by inhibiting the enzyme squalene 2, 3-epoxidase. This inhibition of enzyme activity results in decreased amounts of sterols, especially ergosterol, and a corresponding accumulation of squalene in the cells.
Pharmacokinetics
PHARMACOKINETICS SECTION
In vitro and
in vivo bioavailability studies have demonstrated that naftifine penetrates the stratum corneum in sufficient concentration to inhibit the growth of dermatophytes.
Following single topical applications of
3H- labeled naftifine gel 1% to the skin of healthy subjects, up to 4.2% of the applied dose was absorbed. Naftifine and/or its metabolites are excreted via the urine and feces with a half-life of approximately two to three days.
INDICATIONS AND USAGE
INDICATIONS & USAGE SECTION
Naftin
® Gel, 1% is indicated for the topical treatment of tinea pedis, tinea cruris, and tinea corporis caused by the organisms
Trichophyton rubrum, Trichophyton mentagrophytes, Trichophyton tonsurans *
1,
Epidermophyton floccosum *
1.
1 Efficacy for this organism in this organ system was studied in fewer than 10 infections.
CONTRAINDICATIONS
CONTRAINDICATIONS SECTION
Naftin
® Gel, 1% is contraindicated in individuals who have shown hypersensitivity to any of its components.
WARNINGS
WARNINGS SECTION
Naftin
® Gel, 1% is for topical use only and not for ophthalmic use.
PRECAUTIONS
PRECAUTIONS SECTION
General
GENERAL PRECAUTIONS SECTION
Naftin
® Gel, 1%, is for external use only. If irritation or sensitivity develops with the use of Naftin
® Gel, 1%, treatment should be discontinued and appropriate therapy instituted. Diagnosis of the disease should be confirmed either by direct microscopic examination of a mounting of infected tissue in a solution of potassium hydroxide or by culture on an appropriate medium.
Information for patients
INFORMATION FOR PATIENTS SECTION
The patient should be told to:
Avoid the use of occlusive dressings or wrappings unless otherwise directed by the physician.
Keep Naftin
® Gel, 1% away from the eyes, nose, mouth and other mucous membranes.
Carcinogenesis, mutagenesis, impairment of fertility
CARCINOGENESIS & MUTAGENESIS & IMPAIRMENT OF FERTILITY SECTION
In a 2-year dermal carcinogenicity study, naftifine hydrochloride cream was administered to Sprague-Dawley rats at topical doses of 1%, 2% and 3% (10, 20, and 30 mg/kg/day naftifine hydrochloride). No drug-related tumors were noted in this study up to the highest dose evaluated in this study of 30 mg/kg/day [3.6 times the maximum recommended human dose (MRHD) based on mg/m2 comparison].
Naftifine hydrochloride revealed no evidence of mutagenic or clastogenic potential based on the results of two in vitro genotoxicity tests (Ames assay and Chinese hamster ovary cell chromosome aberration assay) and one in vivo genotoxicity test (mouse bone marrow micronucleus assay).
Oral administration of naftifine hydrochloride to rats, throughout mating, gestation, parturition and lactation, demonstrated no effects on growth, fertility or reproduction, at doses up to 100 mg/kg/day (12 times MRHD based on mg/m
2 comparison).
Pregnancy
PREGNANCY SECTION
Teratogenic Effects
TERATOGENIC EFFECTS SECTION
Reproduction studies have been performed in rats and rabbits (via oral administration) at doses 150 times or more than the topical human dose and have revealed no evidence of impaired fertility or harm to the fetus due to naftifine. There are, however, no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.
Nursing mothers
NURSING MOTHERS SECTION
It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when Naftin
® Gel,1 % is administered to a nursing woman.
Pediatric use
PEDIATRIC USE SECTION
Safety and effectiveness in pediatric patients have not been established.
ADVERSE REACTIONS
ADVERSE REACTIONS SECTION
During clinical trials with Naftin
® Gel, 1%. the incidence of adverse reactions was as follows: burning/stinging (5.0%), itching (1.0%), erythema (0.5%), rash (0.5%), skin tenderness (0.5%).
DOSAGE AND ADMINISTRATION
DOSAGE & ADMINISTRATION SECTION
A sufficient quantity of Naftin
® Gel, 1% should be gently massaged into the affected and surrounding skin areas twice a day, in the morning and evening. The hands should be washed after application. If no clinical improvement is seen after four weeks of treatment with Naftin
® Gel, 1%, the patient should be re-evaluated.
HOW SUPPLIED
HOW SUPPLIED SECTION
Naftin
® (naftifine hydrochloride) Gel, 1% is supplied in collapsible tubes in the following sizes
Observed FDA ZIP history: Each table is queried independently by exact application/product key from successfully parsed Orange Book snapshots. Capture times identify archived source observations; absence or a change between snapshots is not inferred. FDA publication files that were not recoverable as structured ZIP data are not represented as states.
OpenFDA label data provides additional search and identifier links. DailyMed’s Structured Product Label is the canonical label on FDA.report. Matching records are deduplicated before they are shown below.