Along with Propecia, Rogaine is one of the only proven hair loss medication options approved by the FDA for treating hair loss. Minoxidil, (Rogaine’s active ingredient), was originally created as a drug for treating hypertension (high blood pressure). It was then discovered that one of its side affects was growing hair. Minoxidil was then tested for use a topical application for regrowing hair. The results were sufficiently impressive that the FDA approved it as a treatment for hair loss.