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Both of the drugs that are currently medically approved treatments for hair loss were discovered by accident rather than design.
Minoxidil was first discovered in the 1970’s and taken as a tablet for high blood pressure. It was subsequently noted that some men and women who were taking this drug found that their hair was growing more quickly than previously and some patients even saw some re-growth in thinning areas of their scalp, as a side effect of treatment.
Finasteride has been used since the 1990’s as a treatment for prostate problems in men. Again, as a side effect, new hair growth was noted by some men taking the drug.
The companies that marketed these products then proceeded to set up the clinical trials necessary to be granted a medical licence for the treatment of hair loss by proving that the drugs were safe and effective.
Currently, many other drugs to treat hair loss are in development. For further information on the development of these a useful site to visit is the Regrowth website.
If you are considering using drugs to treat hair loss, the following information will give you a basic understanding of what's involved. It can't answer all your questions, since a lot depends on the individual. Please ask a qualified practitioner about anything you don't understand.