Presently, there are two medications that are approved by the FDA for the treatment of hair loss: finasteride (Propecia®) and minoxidil (Rogaine®) . Finasteride is an oral medication that is successful in retarding hair loss in men. In some patients, it will actually thicken the existing hair and regrow hair that has already been lost. Minoxidil is available as a topical solution for use by both men and women, and can also be taken orally (off label). These drugs are most effective in patients who are thinning and not already bald. If successful, they need to be continued indefinitely. Most of the hair regrowth occurs in the back of the head (crown) but improvement also can be seen in the front (hairline) and mid-scalp.
There is also some evidence to suggest that shampoos containing either zinc pyrithione or ketoconozole may be effective in retarding hair loss.