Caspofungin belongs to which antifungal drug class?

• A. Echinocandins
• B. Azoles
• C. Polyenes
• D. Allylamines

Answer: (A)

Caspsofungin’s function is the clue to its class: it blocks the synthesis of beta-1,3-glucan, a key polysaccharide component of the fungal cell wall. By inhibiting the enzyme responsible for making this wall material, caspofungin compromises the integrity of the fungal cell wall, leading to fungal death in many species. This mechanism is the hallmark of echinocandins, a group that includes caspofungin, micafungin, and anidulafungin, all targeting cell wall synthesis rather than the fungal membrane.

In contrast, drugs in the azole family interfere with ergosterol production in the membrane, polyenes bind to ergosterol to form pores in the membrane, and allylamines block squalene epoxidase early in the ergosterol pathway. Because caspofungin acts on the cell wall rather than the membrane, it fits best with the echinocandin class.