Finasteride (finasteride) — Uses, Dosage, Side Effects & Safety

Drug class: 5-alpha reductase inhibitor

Overview

Finasteride is a prescription medication used to treat benign prostatic hyperplasia (BPH) in adult men and male pattern hair loss (androgenetic alopecia) in men. It works by blocking the action of an enzyme called 5-alpha reductase, which converts testosterone to dihydrotestosterone (DHT), a hormone linked to prostate growth and hair loss. By lowering DHT levels, finasteride helps shrink an enlarged prostate, improving symptoms such as difficulty urinating, and can slow hair loss or promote hair regrowth in men with male pattern baldness. It is not approved for use in women or children. Women who are pregnant or may become pregnant should not handle crushed or broken tablets due to the risk of birth defects. Key points: Finasteride is taken once daily, and it may take several months to notice benefits. Consistent use is important for effectiveness. Stopping the medication can reverse its effects over time.

Frequently Asked Questions about Finasteride

How long does it take for finasteride to work?

For BPH, symptom improvement may be seen within a few months, but full benefits can take up to 6 months. For hair loss, noticeable effects may take 3–6 months, with maximum benefit after 12 months of continuous use.

Can women use finasteride?

No, finasteride is not approved for use in women and can cause birth defects if used during pregnancy. Women who are or may become pregnant should not handle crushed or broken tablets.

Are the sexual side effects permanent?

Most sexual side effects, such as decreased libido or erectile dysfunction, resolve after stopping the medication. However, in rare cases, some symptoms may persist.

Does finasteride prevent prostate cancer?

Finasteride may lower the overall risk of prostate cancer but may increase the risk of developing high-grade prostate cancer. Discuss the risks and benefits with your doctor.

Can I stop taking finasteride suddenly?

You should not stop taking finasteride without consulting your healthcare provider. Stopping may reverse its benefits over time.

Is it safe to donate blood while taking finasteride?

You should not donate blood while taking finasteride and for at least 1 month after stopping, to prevent exposure to pregnant women.

Does finasteride interact with other medications?

Finasteride has a low risk of drug interactions, but always inform your healthcare provider about all medications and supplements you are taking.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.