# Anti-Fungal Agents in Dermatology: Pharmacology & Use
> Explore the mechanisms, classification, and clinical applications of antifungal drugs like Azoles and Terbinafine in dermatological practice.

Tags: pharmacology, dermatology, antifungals, medical-education, terbinafine, azoles, mycoses
## Anti-Fungal Agents in Dermatology
* Pharmacology, mechanisms, and clinical applications based on standard references like K.D. Tripathi and Katzung.

## Introduction to Mycoses
* Dermatological fungal infections affect skin, hair, and nails.
* Targets: Chitin in cell walls and Ergosterol in cell membranes.

## Classification of Drugs
* **Antibiotics:** Polyenes (Amphotericin B, Nystatin), Heterocyclic Benzofuran (Griseofulvin).
* **Antimetabolites:** 5-FC.
* **Azoles:** Imidazoles (Clotrimazole), Triazoles (Fluconazole, Itraconazole).
* **Allylamines:** Terbinafine.

## Mechanism of Action
* **Polyenes:** Bind to ergosterol, forming micropores that cause leakage of K+ (Fungicidal).
* **Azoles:** Inhibit lanosterol 14-alpha-demethylase, blocking ergosterol synthesis (Fungistatic).
* **Allylamines:** Inhibit squalene epoxidase, leading to toxic squalene accumulation.

## Systemic Therapy Comparison
* **Fluconazole:** >90% bioavailability, water-soluble, excellent CSF penetration.
* **Itraconazole:** ~55% bioavailability (variable), lipid-soluble, broad-spectrum (including Aspergillus).
* **Terbinafine:** Gold standard for Onychomycosis due to keratin accumulation.

## Topical Agents
* **Clotrimazole/Miconazole:** Used for Tinea corporis and pedis.
* **Nystatin:** Specific for Candida.
* **Ciclopirox Olamine:** Used in nail lacquers and anti-dandruff shampoos.

## Clinical Guidelines
* **Onychomycosis:** Oral Terbinafine for 6 weeks (fingernails) or 12 weeks (toenails).
* **Tinea Capitis:** Systemic therapy required (Griseofulvin).
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