Dermatophytosis is often a self-limiting disease, with recovery within months, so clipping and topical therapy may be all that is required in many cases - especially since systemic therapy may be accompanied by side effects.
In severe or chronic cases, the treatment of choice is oral griseofulvin. The dose usually recommended for microsized formulations is 15-20 mg/kg/day in cats, although some authors suggest higher doses of up to 150 mg/kg/day for both cats and dogs. Griseofulvin treatment should be continued until at least 2 weeks after clinical recovery and until dermatophytes can no longer be isolated.

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