Drug Class: Allylamine Antifungal | Form: Oral Tablet | Prescription Status: Prescription Only (Rx) — DRAP Registered
What is Terbisil 250mg Tablet? Terbisil 250mg contains Terbinafine Hydrochloride — a potent oral antifungal that kills fungi by disrupting their cell membrane production. Unlike topical antifungal creams, Terbisil works from inside the body — reaching the skin, hair follicles, and nail beds through the bloodstream where topical treatments cannot penetrate effectively. It is particularly effective for nail fungal infections (onychomycosis) which require weeks to months of treatment, and for stubborn skin and scalp fungal infections that have not responded to topical therapy.
What is Terbisil 250mg Used For?
- Onychomycosis — fungal infection of fingernails and toenails (ناخنوں کی پھپھوندی)
- Tinea pedis — athlete's foot, fungal infection between toes (پاؤں کی پھپھوندی)
- Tinea corporis — ringworm of the body (داد — جلد کی پھپھوندی)
- Tinea capitis — fungal infection of the scalp and hair (سر کی پھپھوندی)
- Tinea cruris — fungal infection of the groin area (کمر کے نیچے پھپھوندی)
How Does it Work? Terbinafine blocks the enzyme squalene epoxidase — a critical step in fungal cell membrane (ergosterol) production. Without ergosterol, the fungal cell membrane breaks down and the fungus dies. This mechanism is fungicidal — meaning it actively kills fungi rather than just stopping their growth — leading to more complete and lasting cure rates.
Dosage and Administration
⚠️ Complete the full prescribed course even if symptoms improve early — stopping too soon causes relapse. Liver function monitoring is recommended for prolonged courses.
| Indication | Usual Adult Dose | Frequency | Typical Duration |
|---|---|---|---|
| Toenail fungus | 250mg | Once daily | 12 weeks |
| Fingernail fungus | 250mg | Once daily | 6 weeks |
| Tinea corporis / cruris | 250mg | Once daily | 2 to 4 weeks |
| Tinea capitis | 250mg | Once daily | 4 weeks |
| Tinea pedis | 250mg | Once daily | 2 to 6 weeks |
Active Ingredients
| Ingredient | Strength |
|---|---|
| Terbinafine Hydrochloride | 250mg |
Who Should NOT Take Terbisil 250mg?
- Allergy to Terbinafine or any component of the tablet
- Severe liver disease or active liver condition
- Severe kidney impairment
- Pregnancy or breastfeeding — consult doctor before use
- Children under 18 unless specifically prescribed by a specialist
Side Effects
Common: Nausea, mild stomach discomfort, headache, skin rash, mild taste disturbance or loss of taste (عارضی ذائقے میں تبدیلی).
Serious — Stop and seek emergency help immediately: Yellowing of skin or eyes (یرقان — فوری ڈاکٹر کو دکھائیں), severe upper abdominal pain, dark urine, persistent loss of taste lasting beyond treatment, severe skin reactions including blistering or peeling, signs of depression or mood changes, severe allergic reaction with swelling of face or throat.
Drug Interactions
| Medicine | Interaction |
|---|---|
| Warfarin / blood thinners | Terbinafine may increase or decrease Warfarin effect — INR monitoring required |
| Antidepressants (TCAs, SSRIs) | Terbinafine increases their blood levels — increased side effect risk |
| Rifampicin | Significantly reduces Terbinafine blood levels — reduced effectiveness |
| Cimetidine | Increases Terbinafine blood levels — increased side effect risk |
| Caffeine | Terbinafine slows caffeine metabolism — increased caffeine sensitivity |
| Cyclosporine | Terbinafine reduces Cyclosporine blood levels — monitor closely |
Storage: Store below 25°C in a cool, dry place. Protect from moisture and direct sunlight. Keep in original packaging. Keep out of reach of children (بچوں کی پہنچ سے دور رکھیں). Do not use after expiry date.
FAQs
Q: How long before I see improvement in nail fungal infection with Terbisil? Visible nail improvement appears gradually as the healthy nail grows — full results are only seen several months after completing treatment as the new nail replaces the infected one.
Q: Can I stop Terbisil early if my skin infection looks healed? No — always complete the full prescribed course. Stopping early leaves surviving fungi that can cause relapse, and nail infections particularly require the complete duration to achieve full cure.
Q: Is liver damage a real concern with Terbisil? Serious liver problems are rare but possible — your doctor may check liver function before and during long courses. Report any yellowing of skin, dark urine, or unusual fatigue immediately.
⚕️ Medical Disclaimer: This information is for general awareness only and does not replace medical advice. Always consult a qualified doctor or pharmacist before taking any prescription medicine.