Proscar (finasteride) can disrupt normal male hormone levels and lead to severe side effects in men, including persistent sexual dysfunction and gynecomastia (growth of male breasts).
Proscar Side Effects
Proscar (5-mg finasteride) is a prescription medication for men with enlarged prostate glands. It works by inhibiting 5-alpha reductase, which disrupts normal levels of male hormones. In rare cases, this can increase levels of female hormones and cause side effects.
Serious side effects of Proscar include:
- Gynecomastia: Causes the enlargement of glandular tissue, resulting in the growth of male breasts. This disfiguring and embarrassing condition often must be treated with surgery to cut out the mammary gland and remove excess skin.
- Sexual dysfunction: The FDA updated the label on Proscar in 2011 and 2012 to warn about persistent erectile dysfunction and decreased libido. Other sexual side effects include decreased volume or semen and male infertility.