1. Basic Information & Physicochemical Properties

2. Pharmacological Profile & Mechanism of Action

As an allylamine antifungal, terbinafine hydrochloride inhibits squalene epoxidase, disrupting ergosterol biosynthesis in fungal cell membranes. This dual action mechanism:

• Depletes ergosterol (essential membrane component)
• Accumulates squalene (toxic to fungal cells)

Exhibits fungicidal activity against dermatophytes (MIC range: 0.001-0.01 μg/mL) and fungistatic action against Candida species.

3. Approved Clinical Applications

4. Dosage Forms & Administration

Available Formulations:

• Oral tablets: 250 mg
• Topical preparations: 1% cream/gel/spray

Recommended Dosages:

• Adults: 250 mg daily (oral)
• Pediatrics (>2 years): Weight-based dosing
• Topical: Apply twice daily to affected areas

5. Adverse Reactions & Safety Considerations

Common Reactions (≥1% incidence):

• Gastrointestinal: Nausea (5.6%), diarrhea (3.7%)
• Dermatological: Rash (1.3%), pruritus (1.1%)

Serious Adverse Events:

• Hepatotoxicity (0.01-0.1%)
• Stevens-Johnson syndrome (<0.01%)
• Taste disturbance (0.6%)

6. Contraindications & Drug Interactions

Absolute Contraindications:

• Hypersensitivity to allylamines
• Chronic/active liver disease
• Severe renal impairment (CrCl <30 mL/min)

Significant Interactions:

• CYP2D6 inhibitors: ↑ Terbinafine exposure
• SSRIs: Potential ↑ QTc interval

7. Storage & Handling Guidelines

• Store at 20-25°C (68-77°F)
• Protect from light and moisture
• Retain in original packaging
• Discard expired products per local regulations