Microcidal is primarily used to treat fungal infections (dermatophytoses) of the skin, hair, and nails caused by specific fungi, particularly species of Microsporum, Trichophyton, and Epidermophyton[2]. Common indications include:
- Tinea corporis (ringworm of the body)
- Tinea pedis (athlete’s foot)
- Tinea cruris (ringworm of the groin and thigh, also known as jock itch)
- Tinea barbae (barber’s itch/beard area)
- Tinea capitis (ringworm of the scalp)
- Tinea unguium/onychomycosis (ringworm infection of the nails)
These infections must be confirmed to be due to one or more of the susceptible dermatophyte genera (Microsporum, Trichophyton, Epidermophyton) for Microcidal treatment to be appropriate[2]. Accurate identification of the causative organism via mycological examination is essential, as Microcidal is ineffective against other types of fungal infections, such as those caused by Candida species, or against bacterial, protozoal, or viral diseases[2][3].
Microcidal works by binding to keratin in skin, hair, and nails, making these tissues resistant to further fungal infection and allowing healthy tissue replacement as infected keratin is shed[2].
Limitations and special notes:
- Treatment is ineffective for non-dermatophyte fungal infections like candidiasis, tinea versicolor, and systemic mycoses[3].
- Microcidal is not useful for minor infections that respond to topical treatments alone[3].
- Specific dermatophyte species that respond include Microsporum canis, M. audouini, Trichophyton rubrum, T. mentagrophytes, T. verrucosum, and Epidermophyton floccosum, among others[2][3].
- Resistance may occur in some areas, and higher than conventional doses may be required for certain strains[2].
Microcidal should only be prescribed after proper identification of the fungal pathogen, and it must not be used in conditions for which it is contraindicated, such as porphyria[2][3].
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