Ce este Terbinafine?
Terbinafine is an allylamine antifungal medicine used primarily to treat dermatophyte fungal infections of the skin and nails. It is approved by the European Medicines Agency (EMA) and is considered a first-line treatment for fungal nail infection (onychomycosis) and tinea infections.
In the context of sexual health, terbinafine is most commonly prescribed for fungal infections of the groin (tinea cruris, also known as “jock itch”) and the genital skin area, which may be associated with or confused with sexually transmitted conditions. Understanding that these are dermatophyte fungal infections (not candidal or STI-related) is important for selecting appropriate treatment.
Terbinafine is available as oral tablets (250 mg) for systemic treatment of nail and widespread skin infections, and as topical cream (1%) for localised skin fungal infections.
Cum funcționează Terbinafine?
Terbinafine is an allylamine antifungal that works by inhibiting squalene epoxidase, a fungal enzyme involved in the early stages of ergosterol biosynthesis. This mechanism differs from azole antifungals (fluconazole, clotrimazole), which act at a later stage in the same biosynthetic pathway.
Procesul este următorul:
- Squalene epoxidase inhibition: Terbinafine inhibits the enzyme that converts squalene to squalene epoxide, an early step in ergosterol synthesis.
- Squalene accumulation: The block causes squalene to accumulate within the fungal cell to toxic levels, as squalene epoxide cannot be formed.
- Ergosterol depletion: The fungal cell membrane becomes deficient in ergosterol, disrupting membrane integrity.
- Dual mechanism of toxicity: Both the depletion of ergosterol and the toxic accumulation of squalene contribute to fungal cell death.
- Fungicidal against dermatophytes: Terbinafine is fungicidal (kills fungi) against dermatophytes at clinically relevant concentrations, contributing to its high cure rates for nail infections.
Why terbinafine is selective for fungi: Squalene epoxidase is present in both humans and fungi, but terbinafine has approximately 10,000 times greater selectivity for the fungal enzyme than the human enzyme.
Limited Candida activity: Terbinafine is predominantly fungistatic (growth-inhibiting) rather than fungicidal against Candida species, which is why it is not the preferred choice for candidal infections.
Pentru cine este indicat Terbinafine?
Oral terbinafine is indicated for:
- Onychomycosis (fungal nail infection): Caused by dermatophytes (Trichophyton rubrum, T. mentagrophytes) — the most common indication
- Extensive tinea pedis (athlete’s foot): When topical treatment is insufficient
- Tinea corporis (ringworm) and tinea cruris (groin ringworm): For widespread or treatment-resistant cases
Topical terbinafine cream 1% is indicated for:
- Localised tinea pedis (athlete’s foot)
- Tinea corporis (ringworm)
- Tinea cruris (jock itch / groin ringworm)
- Pityriasis versicolor (caused by Malassezia species)
Not appropriate for:
- Vaginal candidiasis (use clotrimazole or fluconazole)
- Oral candidiasis (use nystatin or fluconazole)
- Patients with severe liver disease (oral terbinafine is contraindicated)
- Pregnancy (avoid systemic terbinafine unless clearly necessary; topical use may be acceptable in some cases — doctor assessment required)
Dozaj
Oral Terbinafine (systemic treatment)
| Indication | Dose | Duration |
|---|---|---|
| Fingernail onychomycosis | 250 mg once daily | 6 weeks |
| Toenail onychomycosis | 250 mg once daily | 12 weeks |
| Tinea pedis (extensive) | 250 mg once daily | 2–6 weeks |
| Tinea corporis / tinea cruris (extensive) | 250 mg once daily | 2–4 weeks |
Oral terbinafine can be taken with or without food.
Topical Terbinafine Cream 1%
| Indication | Application | Duration |
|---|---|---|
| Tinea pedis (athlete’s foot) | Once or twice daily | 1–2 weeks |
| Tinea corporis / cruris | Once or twice daily | 1–2 weeks |
| Pityriasis versicolor | Once daily | 2 weeks |
Apply a thin layer to the affected area and 2–3 cm of surrounding skin. Allow to dry.
Efecte secundare
Oral Terbinafine
Common side effects (affecting 1 to 10 in 100 people):
- Gastrointestinal symptoms: nausea, diarrhoea, abdominal discomfort, loss of appetite
- Headache
- Taste disturbances (dysgeusia) — including loss of taste; usually reversible after stopping but can persist
- Skin rash and urticaria
Less common side effects:
- Elevated liver enzymes (liver function monitoring is recommended)
- Joint and muscle pain (arthralgia, myalgia)
- Dizziness
Rare but serious:
- Hepatotoxicity: Serious liver reactions including cholestasis, hepatitis, and very rarely liver failure — monitor for jaundice, dark urine, pale stools, persistent nausea
- Severe skin reactions: Stevens-Johnson syndrome, toxic epidermal necrolysis (very rare)
- Haematological effects: Agranulocytosis, pancytopenia (very rare)
- Taste loss: Severe, prolonged taste disturbance or complete taste loss has been reported; may last months after stopping treatment
Topical Terbinafine
Generally well tolerated. Local skin reactions (burning, itching, redness) at the application site are uncommon.
Terbinafine vs alternative
| Treatment | Route | Duration | Cure Rate (Toenail) | Notes |
|---|---|---|---|---|
| Terbinafine | Oral | 12 weeks | ~60–80% | First-line; fungicidal |
| Itraconazole | Oral (pulse) | 3 months | ~50–70% | Alternative; drug interactions |
| Fluconazole | Oral | 6–12 months | ~40–60% | Longer course; weekly dosing |
| Amorolfine | Topical nail lacquer | 6–12 months | ~35–50% | For mild cases; no liver risk |
Oral terbinafine is generally considered the most effective oral treatment for toenail onychomycosis due to its fungicidal activity against dermatophytes.
Cum puteți obține Terbinafine online în Europa
Oral Terbinafine este un medicament eliberat numai pe bază de prescripție medicală în toate statele membre ale UE. Nu poate fi eliberat legal fără o prescripție valabilă de la un medic autorizat.
Prescrivia funcționează ca intermediar tehnologic: nu prescriem medicamente, nu angajăm medici și nu vindem medicamente. Platforma noastră conectează pacienții cu medici independenți înregistrați în UE, care pot efectua evaluări medicale online confidențiale.
Procesul este următorul:
- Completați un chestionar medical: Describe the affected nails or skin, duration of infection, and any relevant medical history including liver disease or other medications.
- Evaluarea medicului: An independent EU-registered doctor reviews your assessment. If terbinafine is clinically appropriate, they may issue a prescription.
- Prescripție și livrare: The prescription is sent to a licensed EU pharmacy partner for dispensing and direct delivery.
Important: Prescrivia does not guarantee that a prescription will be issued. All prescribing decisions are made independently by qualified medical professionals.
Informații importante privind siguranța
Do not take oral Terbinafine if you:
- Have active or chronic liver disease
- Have severe kidney disease
- Are pregnant (avoid unless clearly necessary — discuss with doctor)
- Are breastfeeding (terbinafine passes into breast milk — avoid)
- Are allergic to terbinafine
Tell your doctor before taking Terbinafine if you:
- Have any history of liver problems
- Have autoimmune conditions such as lupus (terbinafine has been associated with triggering or worsening cutaneous and systemic lupus erythematosus)
- Are taking other medicines metabolised by the CYP2D6 enzyme, including antidepressants (TCAs, SSRIs), antipsychotics, and beta-blockers (terbinafine inhibits CYP2D6)
- Are taking ciclosporin (terbinafine may reduce ciclosporin blood levels)
- Are taking caffeine-containing medicines (terbinafine reduces caffeine metabolism)
Surse
Informațiile medicale de pe această pagină se bazează pe următoarele surse:
- European Medicines Agency (EMA). Terbinafine — Summary of Product Characteristics. Available at: ema.europa.eu
- World Health Organization (WHO). WHO Model List of Essential Medicines. 22nd edition, 2021. who.int
- Gupta AK, et al. Onychomycosis: a review of clinical features, epidemiology, and treatment. Journal of the European Academy of Dermatology and Venereology. 2020.
Acest conținut este revizuit periodic pentru a reflecta ghidurile clinice actualizate. Este furnizat exclusiv în scop informativ și nu constituie sfat medical. Consultați întotdeauna un profesionist medical calificat pentru sfaturi relevante pentru circumstanțele dumneavoastră individuale de sănătate.
Frequently asked questions
- Pentru ce se utilizează Terbinafine?
- Terbinafine is an antifungal medicine primarily used to treat dermatophyte fungal infections of the nails (onychomycosis) and skin. Common conditions treated include fungal nail infection (tinea unguium), athlete's foot (tinea pedis), ringworm (tinea corporis), and fungal groin infection (tinea cruris). It is available as oral tablets and topical cream.
- Cât timp does oral Terbinafine take to work for nail fungal infection?
- Oral terbinafine is taken for 6 weeks for fingernail infections and 12 weeks for toenail infections. However, because nails grow slowly, visible improvement may not be apparent for several months after completing treatment. Full nail clearance can take 6–12 months or more after the course ends, as the healthy nail gradually grows out replacing the infected nail.
- Is Terbinafine effective against vaginal thrush?
- No. Terbinafine is highly effective against dermatophyte fungi (Trichophyton, Microsporum, Epidermophyton species) but has limited activity against Candida species, which cause vaginal thrush. For vaginal candidiasis, antifungals such as clotrimazole (Canesten Gyno) or fluconazole (Diflucan) should be used instead.
- Care sunt the liver-related risks with oral Terbinafine?
- Oral terbinafine can rarely cause liver enzyme elevations and, very rarely, serious hepatic events including liver failure. The EMA recommends that liver function should be assessed before starting oral terbinafine, and patients should be monitored for signs of liver problems during treatment. Terbinafine should be discontinued if liver problems develop.
- Pot obține Terbinafine online în Europa?
- Puteți accesa acest medicament prin platforme intermediare online care vă conectează cu medici independenți înregistrați în UE. După completarea unui chestionar medical confidențial, un medic va evalua dacă medicamentul este adecvat clinic pentru dumneavoastră.
Tratamente
Prescrivia este doar o platformă intermediară. Nu furnizăm servicii medicale, nu prescriem tratamente și nu eliberăm medicamente. Toate deciziile medicale sunt luate de medici independenți înregistrați în UE. Toate medicamentele sunt eliberate de farmacii licențiate din UE. Această platformă facilitează legătura între pacienți și furnizorii de servicii medicale.