Finasteride (Propecia®)

Blocks the 5-alpha-reductase enzyme, and thereby inhibits conversion of testosterone to DHT. At a dose of 1 mg/day, finasteride lowers serum and scalp DHT levels by more than 60 percent. The drug does not interfere with testosterone action. After 6 or 12 months of treatment, hair count was 9% higher in patients treated with finasteride. compared with placebo. After 48 months of therapy, hair count was 24% higher. The recommended dose of finasteride is 1 mg per day. Hair regrowth will be lost over six to nine months if finasteride is discontinued.

Dutasteride 
Works by the same mechanism as finasteride. It is a more powerful blocker of the enzyme responsible for hair loss. Studies have not been done to assess if it is better at promoting hair growth than finasteride.
Topical minoxidil (Rogaine)
Is an alternative for patients who prefer to avoid oral medication. Available in 2% and 5% strengths but the 5% solution is more effective. Must be used twice a day for at least four months. Hair growth may be seen within four to eight months and stabilizes at 12 to 18 months. Thus, a full year of treatment is recommended.

Blocks the 5-alpha-reductase enzyme, and thereby inhibits conversion of testosterone to DHT. At a dose of 1 mg/day, finasteride lowers serum and scalp DHT levels by more than 60 percent. The drug does not interfere with testosterone action. After 6 or 12 months of treatment, hair count was 9% higher in patients treated with finasteride. compared with placebo. After 48 months of therapy, hair count was 24% higher. The recommended dose of finasteride is 1 mg per day. Hair regrowth will be lost over six to nine months if finasteride is discontinued.

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