Per WebMD, the following two treatments have been clinically proven to successfully treat hair loss in men to varying degrees. We have removed the drugs company names and have only given their generic names. So that the material does not seems targeted towards a particular brand.
Finasteride is the generic name for the brand name drugs Proscar and Propecia. Finasteride was originally developed by the pharmaceutical company Merck as a drug (Proscar) to treat enlarged prostate glands.
During the trials on men with prostate problems, researchers noted an intriguing side effect: hair growth. Since finasteride had already been approved by the FDA to treat enlarged prostates in men, Merck decided to pursue the possibility of developing finasteride as the first pill to treat male pattern baldness. Minoxidil, a topical liquid solution, was already on the market (see below).
In December 1997, the FDA approved a 1mg dose of finasteride for the treatment of androgenetic alopecia (male pattern baldness) in men. Propecia is the first drug in history to effectively treat male pattern baldness in the majority of men who use it.
Minoxidil was the first drug approved by the FDA for the treatment of male pattern baldness. For many years, minoxidil, in pill form (brand name Loniten), was widely used to treat high blood pressure. Just like finasteride, researchers discovered a very interesting side effect of the drug. People taking the medication were growing hair in unexpected places, such as on their cheeks and the back of their hands. Some people grew hair on their foreheads.
Some enterprising researchers had the notion that applying minoxidil topically, directly on the head, might grow hair on balding areas. It did, to varying degrees depending on the extent of the hair loss, but at the time it was revolutionary.
While minoxidil has been clinically proven to slow the progression of hair loss and regrow some hair, most experts see it as a relatively marginally effective drug in the fight against hair loss. Since minoxidil has no effect on the hormonal process of hair loss, its positive effects are at best temporary and usually yield somewhat disappointing results.
The American Hair Loss Association still recommends the drug for those who have not responded favorably to finasteride treatment or for those who would like to add another product to their regimen. The AHLA does not recommend minoxidil as the first line of attack for men suffering with male pattern baldness, but does recognize it as an effective treatment for a small percentage of its users.