Propecia, also known by the generic name finasteride, is a prescription drug used to treat symptoms of prostate hyperplasia, prostate cancer and hair loss. Propecia prevents the production of dihydrotestosterone, a hormone involved in prostate enlargement as well as hair follicle loss. The side effects of Propecia treatment are typically mild and are very rare. Nonetheless, Propecia users should be aware of the potential dangers of Propecia use.
Allergic Reaction
Anaphylactic shock and severe allergic reactions are rare, though possible, with Propecia use. Seek emergency attention if you experience any symptoms of allergic shock while taking Propecia, including rash, hives, itching, chest tightening, swelling of the skin and fainting.
Severe Side Effects
While the majority of Propecia complications are mild, some side effects can be a sign of a dangerous reaction. Contact a medical professional promptly if you experience serious side effects of Propecia use, including breast enlargement or breast lumps or breast pain. Testicular pain is also a serious side effect of Propecia.
Sexual Side Effects
A small number of Propecia users have reported genitourinary side effects with Propecia use. Drug safety information provided by Drugs.com reports that up to 18.5 percent of men using Propecia may experience impotence. Up to 10 percent of individuals taking Propecia may experience decreased libido. Abnormal ejaculations were reported by about 7 percent of Propecia users. Other reported sex-related side effects of Propecia include erectile dysfunction and testicular pain. About 1 percent of patients taking Propecia will discontinue use as a result of sexual complications.
Nervous System Complications
The Mayo Clinic lists a number of mild neurological side effects of Propecia. These include headache, dizziness and sleepiness. Such effects are typically harmless and will subside as the body adjusts to the medicine. Notify your physician if such side effects persist or worsen with Propecia use.
Cardiovascular Side Effects
Hypertension and hypotension have both been reported as rare side effects of Propecia.
Gastrointestinal Side Effects
Gastrointestinal side effects of Propecia are mild and rare. Nausea and flatulence have been reported as gastrointestinal side effects of Propecia use.
