Naftin Gel

Medical Editor: John P. Cunha, DO, FACOEP Last updated on RxList: 9/22/2021
Drug Description

What is Naftin Gel and how is it used?

Naftin Gel is a prescription medicine used to treat the symptoms of fungus on your skin such as athlete’s foot, jock itch, and ringworm infections (Dermatophytoses). Naftin Gel may be used alone or with other medications.

Naftin Gel belongs to a class of drugs called Antifungals, Topical.

It is not known if Naftin Gel is safe and effective in children younger than 12 years of age.

What are the possible side effects of Naftin Gel?

Naftin Gel may cause serious side effects including:

  • hives,
  • difficulty breathing,
  • swelling of your face, lips, tongue, or throat, and
  • severe skin irritation after applying this medicine

Get medical help right away, if you have any of the symptoms listed above.

The most common side effects of Naftin Gel include:

  • skin dryness, and
  • irritation of treated skin

Tell the doctor if you have any side effect that bothers you or that does not go away.

These are not all the possible side effects of Naftin Gel. For more information, ask your doctor or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

DESCRIPTION

NAFTIN Gel is a clear to yellow gel for topical use only. Each gram of NAFTIN Gel contains 20 mg of naftifine hydrochloride, a synthetic allylamine antifungal compound.

Chemically, naftifine HCl is (E)-N-Cinnamyl-N-methyl-1-napthalenemethylamine hydrochloride.

The molecular formula is C21H21N•HCl with a molecular weight of 323.86.

The structural formula of naftifine hydrochloride is:

NAFTIN (naftifine hydrochloride) Structural Formula Illustration

NAFTIN Gel contains the following inactive ingredients: alcohol, benzyl alcohol, edentate disodium, hydroxyethyl cellulose, purified water, propylene glycol, polysorbate 20 and trolamine.

Indications & Dosage

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INDICATIONS

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

1Efficacy for this organism in this organ system was studied in fewer than 10 infections.

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.

HOW SUPPLIED

Naftin® (naftifine hydrochloride) Gel, 1% is supplied in collapsible tubes in the following sizes

  • 40g - NDC 54766-770-40
  • 60g - NDC 54766-770-60
  • 90g - NDC 54766-770-90

Note: Store Naftin® Gel, 1% at room temperature.

Distributed by Sebela Pharmaceuticals Inc. 645 Hembree Parkway, Suite I, Roswell, Georgia 30076. Revised: May 2018

QUESTION

Ringworm is caused by a fungus. See Answer
Side Effects & Drug Interactions

SIDE EFFECTS

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%).

DRUG INTERACTIONS

No Information Provided

Warnings & Precautions

WARNINGS

Naftin® Gel, 1% is for topical use only and not for ophthalmic use.

PRECAUTIONS

General

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.

Carcinogenesis, mutagenesis, Impairment Of fertility

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/m2 comparison).

Pregnancy

Teratogenic Effects

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

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

Safety and effectiveness in pediatric patients have not been established.

Overdose & Contraindications

OVERDOSE

No Information Provided

CONTRAINDICATIONS

Naftin® Gel, 1% is contraindicated in individuals who have shown hypersensitivity to any of its components.

Clinical Pharmacology

CLINICAL PHARMACOLOGY

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 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

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.

Medication Guide

PATIENT INFORMATION

The patient should be told to:

  1. Avoid the use of occlusive dressings or wrappings unless otherwise directed by the physician.
  2. Keep Naftin® Gel, 1% away from the eyes, nose, mouth and other mucous membranes.
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