gombaellenes

Gombaellenes, or antifungal agents, are medicines used to treat fungal infections by inhibiting growth or killing fungal cells. They can be applied topically or given systemically and are used for skin, nail, mucosal, and invasive mycoses. Agents may be fungistatic or fungicidal depending on the organism and drug.

Classes and examples:

- Polyenes: bind to ergosterol in fungal membranes, creating pores and cell leakage. Examples include amphotericin B (systemic, broad spectrum) and nystatin (topical). Nephrotoxicity and infusion reactions are common with amphotericin B.

- Azoles: inhibit lanosterol 14-α-demethylase, blocking ergosterol synthesis. Broad spectrum. Includes fluconazole, itraconazole, voriconazole, posaconazole, isavuconazole. Potential liver toxicity and drug interactions via cytochrome P450; some cause QT changes.

- Allylamines/thiocarbamates: inhibit squalene epoxidase, reducing ergosterol. Terbinafine is the main systemic allylamine, used primarily for dermatophyte infections; topical formulations exist.

- Echinocandins: inhibit β-1,3-glucan synthase, weakening the fungal cell wall. Active against Candida species and some molds, given IV (examples caspofungin, micafungin, anidulafungin).

- Nucleoside analogs: such as flucytosine, converted to 5-fluorouracil, inhibiting fungal DNA synthesis; often used with amphotericin B for cryptococcal meningitis but resistance can occur.

- Other agents: griseofulvin (dermatophytes, oral) and topical antifungals like ciclopirox.

Resistance mechanisms include target modification, efflux, and biofilm formation. Selection of therapy depends on infection site, organism, drug interactions, and toxicity monitoring. Safety considerations and monitoring are essential for all systemic antifungals.