Propecia, the Baldness Pill: Does it Work?En Español (Spanish Version)
If you are a man with hereditary hair loss, there are products available to help you keep your hair. One option is
(Propecia), a prescription medication that is in tablet form and taken orally.
Finasteride was first developed to shrink enlarged prostate glands. Researchers noticed that it also helped grow hair, so a special lower-dose formulation—Propecia—was developed for hair loss.
Finasteride interferes with conversion of testosterone to another hormone called 5 alpha-dihydro-testosterone (or DHT). DHT reduces hair follicle activity. Over time and under the influence of DHT, follicles sprout thinner hairs until no hair regrows. When finasteride blocks DHT production, thinning of hair ceases and a more normal growth may possibly occur.
A review of multiple trials including thousands of men and lasting up to two years found that taking finasteride was associated with improved hair growth and increased hair count, but that is also associated with erectile dysfunction and other sexual problems.
But, it is not only finasteride's ability to grow hair that interests some doctors. Finasteride may help men to stop losing the hair they have. So it appears that even if finasteride does not help you grow lots of new hair, it is a good bet you will keep what you have—at least for a while.
You must be patient, though, and be willing to take the drug once a day indefinitely. It may take 3-4 months before new hair is noticed. If you stop taking the drug, all of your newly grown hair will fall within a year. Also, taking the medication every day can be expensive.
Finasteride has some potentially unsettling side effects. The medication has been associated with a reduced sex drive, problems with ejaculation, and orgasm disorders that continue even after you stop taking the drug. Male infertility and poor semen quality are also possible with finasteride, but these problems should improve after you stop taking the drug.
If you are taking the medication, be sure that your doctors knows. One effect of taking finasteride is that it will lower PSA, a compound produced by the body in the presence of a prostate cancer or just with increased age. Blood tests checking for PSA levels may be more difficult to interpret as a result of the medication being in your system. If you have both hair loss and symptoms of prostate enlargement (hesitancy in urinating or diminished urinary stream), you may find
that these symptoms improve because the medication is also used to treat
benign prostatic hypertrophy
If you have hereditary hair loss, there are treatment options available. Talk to your doctor about whether you are a good candidate to take finasteride. Other options available include hair transplant surgery and the over-the-counter product minoxidil (Rogaine).
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American Hair Loss Council
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Last Reviewed June 2014