What is the mechanism of action for Terbinafine?

• A. Inhibits fungal cell wall synthesis
• B. Interferes with microtubule function
• C. Inhibits squalene epoxidase
• D. Disrupts ergosterol synthesis

Answer: (C)

Terbinafine is an antifungal medication that primarily works by inhibiting the enzyme squalene epoxidase, which is crucial in the ergosterol biosynthetic pathway in fungi. By blocking this enzyme, Terbinafine effectively decreases the production of ergosterol, an essential component of the fungal cell membrane. Ergosterol plays a similar role to cholesterol in human cells and is vital for maintaining the integrity and fluidity of the fungal cell membrane. Without adequate ergosterol, the fungal cell membrane becomes compromised, leading to cell death.

This mechanism is specific to Terbinafine and distinguishes it from other antifungal agents that may target different aspects of fungal biology, such as cell wall synthesis or microtubule function. Understanding this mechanism is essential for comprehending both the therapeutic effects of Terbinafine and its role in the treatment of various fungal infections, such as onychomycosis (nail fungus) and dermatophyte infections.