COLIN CUTHBERT / SCIENCE PHOTO LIBRARY COLIN CUTHBERT / SCIENCE PHOTO LIBRARY
Propecia hair loss pills on a magnified image of a blisterpack. The pills contain finasteride, a drug that acts to block the formation of the hormone dehydroxytestosterone (DHT). Excess DHT is thought to cause hair loss in men. Propecia has been shown in some cases to slow or halt male pattern hair loss (androgenetic alopecia) with regrowth in a few cases. It is intended for hair loss from the top of the head, not a receding hairline. One tablet is taken daily. Pregnant women must avoid the drug, as it may cause abnormalities in a male baby's sex organs. Larger amounts of finasteride are used for shrinking an enlarged prostate gland. Propecia is manufactured by Merck Sharp & Dohme.
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