Upjohn asked the FDA to OK its baldness cure.

Final approval may take up to two years, and the drug will then be sold by prescription, Upjohn said. The Kalamazoo, Mich.-based pharmaceutical company said Regaine topical solution, which is applied externally, has been tested on about 4,000 volunteers. Preliminary data showed that about one-third of the test subjects had acceptable hair grown, one-third grew fine, wispy hair and one-third grew no hair, the company said.