Finasteride 1 mg side effects for hair loss
Most common, usually uncommon:
- Lower sex drive
- Difficulty getting or maintaining an erection
- Less semen volume or ejaculation problems
In clinical trials of finasteride 1 mg, these were reported in about
3.8% of users versus
2.1% with placebo in the first year. Individual rates were roughly: lower libido
1.8%, erectile dysfunction
1.3%, and ejaculation disorder
1.2%. Many cases improved after stopping, and many improved even while continuing. See the
FDA prescribing information.
Less common but important:
- Breast tenderness or enlargement
- Testicular pain
- Rash, itching, hives, or swelling of lips/tongue/face, which can indicate allergy
- Low mood, depression, or rarely suicidal thoughts
- Reduced sperm quality or fertility. This often improves after stopping, but discuss it first if you are trying for a baby.
- Rarely, persistent sexual symptoms after discontinuation have been reported. The exact likelihood is uncertain because post-marketing reports cannot prove the tablet caused every case.
Pregnancy safety
- It must not be used in pregnancy because it can harm development of a male fetus. Pregnant people should not handle crushed or broken tablets. Intact coated tablets are generally designed to prevent contact with the medicine.
Seek medical help promptly for facial or throat swelling, a breast lump/nipple discharge, severe depression, or suicidal thoughts.
Before starting, tell a dermatologist if you have depression, fertility concerns, breast symptoms, liver disease, or take other regular medicines. Finasteride lowers PSA blood-test values, so tell any clinician ordering a PSA test that you take it.
For many people, topical 5% minoxidil is a lower-risk first treatment; finasteride is often added for male-pattern hair loss after discussing the benefit versus these risks.