There are two types of identification tests for female pattern baldness: the Ludwig Scale and the Savin Scale. Both track the progress of diffused thinning, which typically begins on the crown of the head behind the hairline, and becomes gradually more pronounced. For male pattern baldness, the Hamilton–Norwood scale tracks the progress of a receding hairline and/or a thinning crown, through to a horseshoe-shaped ring of hair around the head and on to total baldness.
"I recommend that everyone [with any hair loss] take finasteride," says Robert M. Bernstein, MD. Bernstein is associate clinical professor of dermatology at Columbia University and founder of the Bernstein Medical Center for Hair Restoration. "To patients who are younger,” he says, “I also recommend minoxidil. But the mainstay is finasteride. The data show that, over five years, it significantly retards hair loss in 85% of users."
“The most common cause of hair loss in both men and women is androgenetic alopecia, which is genetic pattern hair loss,” explains Dr. Michael B. Wolfeld, a board-certified plastic surgeon and an assistant clinical professor of plastic surgery at the Icahn School of Medicine at Mount Sinai Hospital in New York. The root cause of this type of hair loss is dihydrotestosterone (DHT), a byproduct of testosterone that shrinks certain hair follicles until they eventually stop producing hair.

There are several different types of medication you can buy to help treat hair loss. Procepia and Finasteride are currently the only approved drugs you can take that will effectively treat hair loss. The active ingredient in both treatments (finasteride) works by blocking DHT (the male hormone dihydrotestosterone) that causes hair loss by shrinking hair follicles on your scalp. It has been proven to lead to hair regrowth or to stop hair loss in around 9 out of 10 men in clinical trials. 
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