How Long Does it Take for Griseofulvin to Work? Symptoms may noticeably improve in a few days, but it usually takes about two to four weeks for skin infections and four to six weeks for hair and scalp infections to be completely gone.

How effective is griseofulvin?

When all 7 studies were pooled, the overall mean effective cure (negative KOH and culture) of griseofulvin at 4 to 6 weeks posttreatment was 73.4% +/- 7% (7 studies, n = 438 patients). Higher efficacy rates appeared to be reported with the use of higher dosages of griseofulvin (> 18 mg/kg/d).

How long does it take for griseofulvin?

It typically takes two to four weeks for skin infections, three to four months for fingernail infections, and at least six months for toenail infections to heal. Continue to take this medicine as long as your doctor tells you to do so.