Every prescription medication has some side effects, and Propecia is no different. Thankfully, Propecia's side effects are rare and usually mild. Most people can take this medication without any serious side effects.
The most discussed side effect of Propecia is its impact on sexual performance and drive. In a small percentage of men taking the medication, Propecia can cause impotence, lower sex drive and decreased semen in ejaculation. Though these side effects usually resolve themselves, they have continued in some men even after stopping treatment. These side effects are not life-threatening, but can have a negative impact on quality of life. If any of these side effects persist or worsen, notify your doctor promptly.
Allergic reactions to Propecia (rashes, hives, itching, swelling, tingling) are very rare but can occur.
Another rare but potentially serious side effect is male breast cancer, which can be indicated by nipple discharge, breast enlargement or tenderness, and breast lumps. If you have any of these symptoms, stop taking Propecia and see your doctor immediately.
Less serious side effects include testicular pain, low blood pressure, depression, fluid retention, and dizziness.
It's important to remember that you are unlikely to suffer from any of these side effects while on Propecia. If you do, they will probably be mild and will resolve as your body adjusts to the medication.
If your side effects are severe or persistent, however, then please contact your doctor or our patient support team immediately.
Some men may also have side effects not mentioned here. If you experience any side effects that you think may be due to this medicine, speak with your doctor or our patient support team.
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*The medical sources used for this article can be viewed on our legal page.