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terbinafine hydrochloride

Lamisil, Lamisil AT

Pharmacologic class: Synthetic allylamine derivative

Therapeutic class: Antifungal

Pregnancy risk category B


Unclear. Thought to interfere with sterol biosynthesis of fungal cell membrane permeability by inhibiting enzymes responsible for normal fungal growth and maturation, resulting in cell death.


Cream: 1%

Gel (topical): 1%

Oral granules: 125 mg, 187.5 mg

Solution (topical): 1%

Spray (topical): 1%

Tablets: 250 mg

Indications and dosages

Tinea cruris; tinea corporis; tinea pedis; tinea versicolor

Adults and children ages 12 and older: Massage cream into affected area and surrounding area once or twice daily for 7 to 14 days, not to exceed 4 weeks. Or, for tinea pedis, apply gel to affected area once daily at bedtime for 1 week. Or, for tinea cruris and tinea corporis, spray or apply gel to affected area once daily (morning or night) for 1 week. Or, for tinea pedis, spray between toes b.i.d. (morning and night) for 1 week.

Onychomycosis of fingernail or toenail

Adults: For fingernail infection, 250 mg P.O. daily for 6 weeks. For toenail infection, 250 mg P.O. daily for 12 weeks.

Tinea capitis

Children ages 4 and older weighing less than 25 kg (55 lb): 125 mg P.O. daily for 6 weeks

Children ages 4 and older weighing 25 to 35 kg (55 to 77 lb): 187.5 mg P.O. daily for 6 weeks

Children ages 4 and older weighing more than 35 kg (77 lb): 250 mg P.O. daily for 6 weeks


• Hypersensitivity to drug or its components

• Chronic active hepatic disease


Use cautiously in:

• renal impairment (use not recommended)

• pregnant or breastfeeding patients (use not recommended)

• children younger than age 12 (safety and efficacy not established with cream, spray, or tablet use).


• Give with or without food, but not with coffee, cola, or tea.

• Know that oral granules should be sprinkled on nonacidic food, such as pudding or mashed potatoes. Fruit-based food such as applesauce shouldn't be used.

• Know that oral granules should be swallowed without being chewed.

• Don't put occlusive dressing over affected area after cream application.

Adverse reactions

CNS: headache, depression

EENT: visual disturbances

GI: nausea, diarrhea, dyspepsia, abdominal pain, flatulence

Hematologic: neutropenia

Hepatic: hepatic failure

Skin: burning, stinging, dryness, itching, and local irritation (with topical form); rash; pruritus; urticaria; erythema multiforme; Stevens-Johnson syndrome

Other: taste and smell disturbances


Drug-drug. Cimetidine: decreased terbinafine clearance

Cyclosporine: increased cyclosporine clearance

Dextromethorphan: increased dextromethorphan blood level

Rifampin: increased terbinafine clearance

Warfarin: altered warfarin efficacy

Drug-diagnostic tests. Hepatic enzymes: increased levels

Neutrophils: decreased count

Drug-food. Caffeine-containing foods and beverages: decreased caffeine clearance

Drug-herbs. Chaparral, comfrey, germander, jin bu huan, kava, pennyroyal: increased risk of hepatotoxicity

Cola nut, guarana, yerba maté: decreased clearance of these herbs

Patient monitoring

• Monitor CBC and liver function tests.

Watch for signs and symptoms of erythema multiforme. Report early indications before they progress to Stevens-Johnson syndrome.

Patient teaching

• Tell patient he may take with or without food.

• Advise caregiver that oral granules should be sprinkled on nonacidic food, such as pudding or mashed potatoes and not to use fruit-based food such as applesauce.

• Advise caregiver that oral granules should be swallowed without being chewed.

• Instruct patient to avoid coffee, tea, and colas, which can worsen adverse drug reactions.

• Tell patient drug may take 4 weeks to be effective in fingernail infections and 10 weeks in toenail infections. Urge him to keep taking it even though symptoms don't improve right away.

Advise patient to immediately report rash, sore throat, cough, fever, or yellowing of skin or eyes.

• Instruct patient how to use topical drug, to wash affected area with soap and water and dry area completely before applying drug, and to wash hands after each use.

• Instruct patient not to place occlusive dressing over affected area after applying cream.

• Advise patient to wear well-fitting, ventilated shoes and to change shoes and socks at least once daily when receiving treatment for athlete's foot.

• Caution patient not to let topical drug contact eyes, nose, or mouth.

• As appropriate, review all other significant and life-threatening adverse reactions and interactions, especially those related to the drugs, tests, foods, and herbs mentioned above.

McGraw-Hill Nurse's Drug Handbook, 7th Ed. Copyright © 2013 by The McGraw-Hill Companies, Inc. All rights reserved


A trademark for the drug terbinafine hydrochloride.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


Terbinafine Dermatology An antifungal for tinea pedis, tinea cruris, tinea corporis due to Epidermophyton floccosum, Trichophyton mentagrophytes, T rubrum, fluconazole-resistant oral candidiasis. See Fluconazole.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


A brand name for TERBINAFINE.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
References in periodicals archive ?
Sales of branded Lamisil in the United States for the 12 months that ended March 31 were about $685 million, according to IMS Health.
Meanwhile, Lamisil tablets totally cured toenail fungus problems in 38% of patients in a separate study, according to the drug's label.
Novartis produces Clozarilm Voltaren, Tegretol, Diovan, Glivec, Neoral, Femara, Ritalin and Lamisil.
By acquiring Merck's OTC activities, Novartis would complement its own consumer line-up of items like the Triaminic cold medicine and Lamisil anti-fungal treatment.
(4) Evans and colleagues (5) reported higher cure rates for pulsed (intermittent) dosing in the Lamisil vs Itraconazole in Onychomycosis (LION) study: 25% complete cure in three cycles; 28% complete cure in four cycles.
Safety and efficacy of oral terbinafine in the treatment of onychomycosis: analysis of the elderly subgroup in improving results in onychomycosis-concomitant Lamisil and debridement (IRON-CLAD), an open-label, randomized trial.
“Though many patients have had no qualms about taking oral antifungal medications such as Lamisil, there are a lot of patients who don't want treatments that come with serious risks or side effects.
You probably tried a topical antifungal medication such as Lamisil to kill the fungus.
(Using similar logic, Novartis recently encouraged people to treat toe fungus by swallowing Lamisil tablets.
Based upon the peak sales of the topical product Penlac ($125 million US, 5.5%-8.5% efficacy) and Lamisil ($1.2 billion world-wide, 38% efficacy, but with the risk of liver failure and death), we believe a topical drug that is both safe and effective can generate peak sales of $700 million by 2020 in the U.S."