Finasteride for Hair Loss: How Well It Works, Side Effects and What to Know First
Written by Naurah Gaspard, DNP, FNP-C, FNP-BC · Medically reviewed by Cherlie Joseph, MSN, FNP-BC · Updated November 2026
Finasteride 1 mg (Propecia and generics) is an FDA-approved daily pill for male pattern hair loss. It lowers DHT, the hormone that shrinks hair follicles, and for many men it stops further loss and regrows some hair. It takes at least 3 months to show benefit, only works while you take it, and is not for anyone who is or may become pregnant.
In this guide
How finasteride works
In men with a genetic tendency, the hormone dihydrotestosterone (DHT) slowly shrinks follicles on the crown and top of the scalp. Finasteride blocks the enzyme (5-alpha reductase type II) that turns testosterone into DHT. With less DHT, many follicles stop shrinking.
The Propecia label says daily use for 3 months or more is generally needed before you see a benefit, and stopping reverses the effect within 12 months. Think of it as a long-term maintenance medicine, much like a daily blood pressure pill.
What results to expect
| Timeframe | What's typical |
|---|---|
| First 3 months | Little visible change; some men notice less shedding |
| 3 to 12 months | Hair loss slows or stops; some regrowth on the crown and mid-scalp |
| 12 months and beyond | Results are best judged here; benefit continues while you keep taking it |
| After stopping | Gains are lost within about 12 months |
Finasteride works best for thinning on the crown and top. It is less helpful for a receding front hairline. Many men combine it with topical or oral minoxidil, which works a different way.
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In clinical trials, the most common side effects were lower sex drive, erection problems and ejaculation changes, which affected a small share of men. The label also lists post-marketing reports of depression, suicidal thoughts, and sexual side effects that continued after stopping. How often these happen can't be reliably estimated, so tell your provider about any history of depression and report mood changes right away.
Pregnancy: finasteride can cause abnormal genital development in a male fetus. People who are or may become pregnant should not take it and should not handle crushed or broken tablets. Intact coated tablets are safe to touch; if contact happens, wash with soap and water. Finasteride is not FDA-approved for women.
Sprays: in April 2025 the FDA warned about compounded topical finasteride products sold online. There is no FDA-approved topical finasteride, and the agency received reports of side effects similar to the pill. It also noted risk to others, especially pregnant women, from contact with the drug.
Finasteride and your PSA test
Finasteride lowers PSA, the blood test used in prostate cancer screening. The prescribing information for finasteride notes PSA falls by roughly half after about 6 months of treatment. Always tell whoever orders your PSA that you take finasteride so the result can be interpreted correctly. A PSA that rises while you are on finasteride should be checked, even if it still looks normal.
Is finasteride right for you?
Finasteride is a good fit for many adult men with early to moderate pattern hair loss who are comfortable taking a daily pill long term. It is less suitable if you have a history of depression, have concerns about sexual side effects, or are actively trying to conceive with a partner (discuss timing with your provider). Sudden, patchy or scarring hair loss needs a diagnosis first.
Generic finasteride is usually inexpensive with a prescription, but prices change, so compare pharmacies or use a discount tool such as GoodRx.
Get in-person care or call 911 if you have:
- Thoughts of suicide or self-harm (call or text 988, or 911 if you are in danger)
- Swelling of the lips, face or throat, hives or trouble breathing
- A new breast lump, nipple discharge or breast pain
- Testicular pain with swelling, fever or nausea
Frequently asked questions
Do finasteride side effects go away?
For most men who have side effects, they ease after stopping the medicine. The label notes rare reports of sexual side effects that continued after stopping. Talk with your provider before stopping or changing your dose so you can weigh the options together.
Can women take finasteride?
Finasteride is not FDA-approved for women. It must not be taken by anyone who is or may become pregnant because it can harm a male fetus, and pregnant women should not handle crushed or broken tablets. Women with pattern hair loss usually start with topical minoxidil.
Is topical finasteride safer than the pill?
Not proven. There is no FDA-approved topical finasteride, and in 2025 the FDA warned about side effects reported with compounded sprays, plus the risk of others touching treated skin or hair. Discuss approved options with your provider.
Sources
- DailyMed (NIH): Propecia (finasteride) prescribing information
- FDA: Potential risks associated with compounded topical finasteride products
- American Academy of Dermatology: Hair loss, who gets it and causes
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Already taking finasteride and need a refill?
$79 refill review by a nurse practitioner licensed in your state. Adults 18+ in FL, NM, OR and WA.
Request a medication refill →
Naurah Gaspard, DNP, FNP-C, FNP-BC
Board-certified family nurse practitioner licensed in Florida, New Mexico, Oregon and Washington, caring for adults online at OurTopClinic. Meet our providers.
This article is for general education and is not a substitute for medical advice. Treatment, including any prescription, is decided by a licensed provider after reviewing your health history. OurTopClinic is not for emergencies; if you have a medical emergency, call 911. OurTopClinic serves adults located in Florida, New Mexico, Oregon and Washington. Learn more at ourtopclinic.com.
