Rogaine, the trade name of the hair growth drug minoxidil, works for women by treating androgenetic alopecia. Women's Rogaine Foam, manufactured specifically for use by women, is FDA-approved and has a 5% concentration of minoxidil. It is also manufactured in a 2% minoxidil concentration topical solution for hair regrowth treatment.
Although minoxidil was originally ingested as a tablet in order to treat high blood pressure, patients began experiencing excessive hair growth as a side effect of the medication. After research indicated that directly applying minoxidil to the scalp also stimulated hair growth, the drug was released for that purpose under the brand name Rogaine. Since then, other brand name and generic versions of hair regrowth treatments have emerged.