Propecia is the brand name of the drug finasteride and is used to treat male pattern hair loss or thinning of the hair on the top of the head, according to MedlinePlus, a publication of the National Institutes of Health. The drug does not work on hair that thins at the temples and can not be used in women or children. Finasteride, which is also used to treat an enlarged prostate, works by blocking a male hormone that interferes with hair growth on the scalp.
Common Side Effects
Finasteride can cause sexual side effects, according to MedlinePlus. These include pain in the testicles, decreased libido, problems having or maintaining an erection, and a reduced amount of semen. If these symptoms are severe or don't clear up on their own, consult a doctor.
Potentially Dangerous Side Effects
According to MedlinePlus, these side effects warrant immediate medical attention: problems in the breasts including pain, lumps, discharge, and growth in size; rash; itching; hives; and swelling of the face, particularly in the lips.
Precautions for Pregnant Women
If a pregnant woman takes finasteride, it can hurt her baby if the baby is male, according to MedlinePlus. Women who are pregnant or might become pregnant should not take the drug or even touch a tablet if it is broken or crushed. If a pregnant woman comes into contact with finasteride, she should seek medical attention.
Hair Loss
Finasteride controls hair loss but it is not a cure, according to MedlinePlus. If you stop taking the drug you will most likely lose the new hair you've grown within a year.
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