Terbinafine (terbinafine) — Uses, Dosage, Side Effects & Safety

Drug class: Antifungal (Allylamine class)

Overview

Terbinafine is a prescription antifungal medication used to treat fungal infections of the skin, hair, and nails, such as athlete's foot (tinea pedis), ringworm (tinea corporis), jock itch (tinea cruris), and fungal nail infections (onychomycosis). It is available in both oral and topical forms. Terbinafine works by stopping the growth of fungi. It does this by interfering with the production of ergosterol, an essential component of fungal cell membranes. Without ergosterol, the fungus cannot survive. Key points for patients: Complete the full course as prescribed, even if symptoms improve early. Oral terbinafine may require several weeks or months for nail infections. Topical forms are generally used for skin infections. Always inform your healthcare provider about any liver problems or other medications you are taking.

Frequently Asked Questions about Terbinafine

How long does it take for terbinafine to work?

Improvement in skin infections is usually seen within a few days to weeks. For nail infections, visible improvement may take several months after completing therapy, as healthy nail growth replaces the infected nail.

Can I drink alcohol while taking terbinafine?

It is best to avoid alcohol while taking terbinafine, as both can affect the liver and increase the risk of liver damage.

What should I do if I develop yellowing of my skin or eyes?

Stop taking terbinafine and contact your healthcare provider immediately. Yellowing of the skin or eyes may be a sign of serious liver problems.

Is terbinafine safe during pregnancy or breastfeeding?

Terbinafine should only be used during pregnancy if clearly needed and prescribed by a doctor. It is excreted in breast milk; breastfeeding is not recommended while taking oral terbinafine.

Can terbinafine be used for all types of fungal infections?

Terbinafine is effective against many dermatophyte (skin, hair, nail) infections but is not effective for all fungal infections, such as those caused by Candida or certain molds.

What are the signs of a serious allergic reaction to terbinafine?

Signs include rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, and trouble breathing. Seek emergency medical help if these occur.

Can children use terbinafine?

Terbinafine may be used in children for certain fungal infections, but dosing and safety should be determined by a pediatrician.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.