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. 
For example, if your hair is thinning because you’ve recently started a new medication or a diet, your approach might be to take an oral supplement or use a laser light device. But if you have hair loss from psoriasis or chemical treatments, you might try a new shampoo and invest in a moisturizing scalp treatment. Throwing everything possible at the problem might not be the most effective method.
These anti-androgenic effects can be used to help treat hair loss. Nizoral shampoo contains 2% ketoconazole and is prescribed not only for the treatment of scalp conditions, but also in combination with other treatments for androgenetic alopecia. A 1% version is now available over-the-counter, but it may not be as effective as the 2% prescription strength. There are no significant side effects.

That said, there are products that don’t have FDA approval or clearance, but may help prevent hair loss. For example, shampoos with ketoconazole, a chemical with anti-DHT properties, is widely used to treat fungal infections but has become popular among consumers as a hair loss treatment. It makes sense — research shows that ketoconazole actually has beneficial effects on hair growth (especially for those with seborrheic dermatitis).
Like minoxidil, finasteride, the active ingredient in Propecia, was originally created with a different purpose in mind -- to treat enlarged prostate glands -- and researchers observed it came with a side effect of hair growth. Unlike topical minoxidil, finasteride requires a prescription, is taken orally and addresses hormonal causes of hair loss. It inhibits the enzyme type II 5-alpha reductase, which converts testosterone into DHT. As it was the first truly effective treatment for hair loss that provided nearly guaranteed results, finasteride revolutionized the hair-loss-treatment industry.
Topical treatments like Rogaine use the active ingredient minoxidil -- originally used to treat high blood pressure. After researchers discovered that it also promoted hair growth, it was the first drug approved by the FDA to treat male pattern baldness. It is used topically on the scalp, and the success of treatment is dependent on the user's extent of hair loss. Researchers at the AHLA find its efficacy to be marginal in the long run since it has no effect on the hormonal process. 
Viviscal is a natural hair-growth supplement that promotes hair growth in people with thinning hair. It contains a marine complex known as AminoMar C. This is made of minerals, vitamins, and shark and mollusk powder. These ingredients help to regenerate new cells and strengthen existing cells. You have to take the pills twice a day for at least six months in order to see results. Viviscal also makes a shampoo and conditioner.
Anti-androgens. Androgen receptor–blocking drugs such as spironolactone (Aldactone) and finasteride (Propecia) are not approved for the treatment of female pattern hair loss, and there is little reliable evidence that they are effective. However, some case studies suggest that women who don't respond to minoxidil may benefit from the addition of spironolactone. In the relatively uncommon cases where there is an excess of androgen, a clinician may prescribe 100 to 200 milligrams of an androgen receptor–blocking drug daily, together with an oral contraceptive for women of reproductive age. (A woman taking one of these drugs should not become pregnant because they can cause genital abnormalities in a male fetus.) Possible side effects include weight gain, loss of libido, depression, and fatigue.
Viviscal is a natural hair-growth supplement that promotes hair growth in people with thinning hair. It contains a marine complex known as AminoMar C. This is made of minerals, vitamins, and shark and mollusk powder. These ingredients help to regenerate new cells and strengthen existing cells. You have to take the pills twice a day for at least six months in order to see results. Viviscal also makes a shampoo and conditioner.
In either sex, hair loss from androgenetic alopecia occurs because of a genetically determined shortening of anagen, a hair's growing phase, and a lengthening of the time between the shedding of a hair and the start of a new anagen phase. (See "Life cycle of a hair.") That means it takes longer for hair to start growing back after it is shed in the course of the normal growth cycle. The hair follicle itself also changes, shrinking and producing a shorter, thinner hair shaft — a process called "follicular miniaturization." As a result, thicker, pigmented, longer-lived "terminal" hairs are replaced by shorter, thinner, non-pigmented hairs called "vellus."
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