In literature many different therapies are proposed to treat Monilethrix, but a definitive therapy still doe not exist. We decided to treat four patients affected by Monilethrix, with topical minoxidil 2%, 1 ml night and day for 1 year. Minoxidil led to a an increase of normal hair shaft without any side effects in all the patients. Therefore topical minoxidil 2% could be considered a good therapy to treat Monilethrix.