Antifungal Medication Classes: A PTCB Study Guide
Explore the major antifungal drug classes including azoles, polyenes, and echinocandins. Essential pharmacology for PTCB exam success.
Antifungal Drug Classes Overview
Fungal infections range from mild skin conditions to life-threatening systemic diseases. Pharmacy technicians must understand the major antifungal classes, their uses, and important safety considerations for both practice and the PTCB exam.
Azole Antifungals
Azoles are the most commonly dispensed antifungal class. They work by inhibiting ergosterol synthesis in the fungal cell membrane. Key medications include:
- Fluconazole (Diflucan) for yeast infections and systemic candidiasis
- Itraconazole (Sporanox) for aspergillosis and histoplasmosis
- Voriconazole (Vfend) for invasive aspergillosis
- Clotrimazole and miconazole for topical fungal infections
Polyene Antifungals
Amphotericin B is the primary polyene antifungal, often called the "gold standard" for severe systemic fungal infections. It binds directly to ergosterol, creating pores in the fungal membrane. Lipid formulations (such as AmBisome) reduce the significant nephrotoxicity associated with conventional amphotericin B.
Echinocandins
This newer class inhibits beta-glucan synthesis in the fungal cell wall. Caspofungin, micafungin, and anidulafungin are all administered intravenously in hospital settings. They are first-line therapy for invasive candidiasis.
Other Antifungals
- Terbinafine (Lamisil) for dermatophyte infections and onychomycosis
- Nystatin for oral and topical candidiasis
- Griseofulvin for dermatophyte infections of hair and nails
Understanding drug interactions is crucial, especially with azole antifungals that inhibit cytochrome P450 enzymes. Strengthen your medication knowledge at our PTCB prep hub and practice with pharmacy flashcards.
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