Finasteride for hair loss: the complete, brand-neutral guide

In short: finasteride 1 mg is a prescription tablet for male pattern baldness. It works by lowering DHT, the hormone that shrinks hair follicles. In trials it stopped further visible loss in most men, and regrew some hair in many. Results take 6–12 months, and they last only while you keep taking it. A small share of men get sexual or mood side effects, so start it only after a proper conversation with a dermatologist.

Prescription medicine. We explain finasteride so you can have a better conversation with your doctor. We don't link to buying it, and you shouldn't start it without a prescription. → Disclaimer

On this page: How it works · Does it work · Who it's for · Dose · Side effects · Before you start · Cost · FAQs

How it works

• In men with pattern baldness, follicles on the top and crown are sensitive to DHT (dihydrotestosterone). DHT gradually shrinks them.
• Finasteride blocks 5-alpha reductase type II, the enzyme that turns testosterone into DHT. This lowers DHT in the blood and scalp by roughly two-thirds.
• With less DHT, the shrinking slows or stops, and some follicles recover.

Finasteride was first approved at 5 mg for an enlarged prostate. The 1 mg dose is the one studied and approved for hair loss.

Does it work?

Finasteride is one of only two medicines with strong, long-term evidence for male pattern baldness. The other is minoxidil.

• In the main 2-year trials, most men on finasteride had no further visible hair loss, compared with about a quarter of men on placebo. Many had visible regrowth, mostly on the crown.
• Follow-up to 5 years showed the benefit continued while men stayed on it.
• A 2022 analysis comparing treatments found finasteride 1 mg among the most effective options, with dutasteride and oral minoxidil also performing well.
• Combining finasteride with minoxidil usually works better than either alone. → Minoxidil vs finasteride

What to expect: the realistic goal is keeping the hair you have. Regrowth is a bonus, more likely if you start early (Norwood stages 2–4) than once areas are completely bald.

Who it's for

Usually considered for:

• Men 18+ with diagnosed male pattern baldness: a receding hairline, crown thinning or overall thinning on top.
• Men who want to slow progression, including before or after a hair transplant.

Not for:

• Women who are or could become pregnant. Finasteride can harm the development of a male baby. Pregnant women shouldn't even handle crushed or broken tablets.
• Children and teenagers.
• Hair loss with another cause (telogen effluvium, alopecia areata, thyroid, iron). → Find the cause first

Talk it through carefully with your doctor if you:

• have a history of depression, anxiety or other mental health conditions,
• have existing sexual health concerns,
• are trying to have a baby (finasteride can lower semen quality in some men),
• are over 40, or have had a PSA test or prostate problems (finasteride lowers PSA readings).

Dose and how to take it

Follow your doctor's prescription.

• 1 mg once a day, with or without food, at about the same time each day.
• Missed a dose? Skip it and take the next one as usual. Don't double up.
• Don't split 5 mg tablets to save money unless your doctor specifically advises it. Doses get uneven, and crushed tablets are a risk for pregnant women in the home.
• Topical finasteride (a spray or solution, often mixed with minoxidil) is an alternative some doctors use to reduce side effects. → Topical finasteride

Side effects in brief

Most men have no side effects. In trials, a small percentage more men on finasteride than on placebo reported:

• lower sex drive, erection problems, or less ejaculate. These usually improved after stopping, and in many men while continuing.
• breast tenderness or enlargement (rare),
• mood changes, including depression. Regulators have added warnings about mood changes and suicidal thoughts.

A small number of men report symptoms that continue after stopping ("post-finasteride syndrome"). This is debated in the research, and it's taken seriously.

Stop and contact your doctor if you notice low mood, anxiety or thoughts of self-harm, breast lumps or nipple discharge, or an allergic reaction (rash, swelling of the lips or face). If you have thoughts of harming yourself, seek help immediately: call 112, or Tele-MANAS on 14416.

→ Full guide: Finasteride side effects: what the research says

Before you start: questions for your doctor

1. Is my hair loss definitely male pattern baldness? What stage is it?
2. Should I start with minoxidil, finasteride, or both?
3. Oral or topical finasteride: which suits me?
4. I have [anxiety / depression / a sexual health concern / plans for a baby]. Does that change anything?
5. Do I need a PSA test or any blood tests first?
6. When should we review progress (usually at 6 and 12 months)?

Tip: take monthly photos in the same light from day 1. → How to track progress

Cost in India

Finasteride 1 mg is available as low-cost generics from several manufacturers. A month's supply usually costs far less than branded hair kits containing the same medicine. → Finasteride brands and prices in India

FAQs

Does finasteride lower testosterone? No. It lowers DHT, and testosterone levels usually rise slightly.

Can I stop finasteride? Yes, at any time (with your doctor). But the hair it was protecting will gradually be lost over the following months, typically within about a year.

Is finasteride a steroid? No. It's an enzyme blocker, not an anabolic steroid.

Will it affect gym gains? There's no good evidence that finasteride affects muscle growth from training.

Can I donate blood while on finasteride? Usually you need to stop for a period first, because the blood could reach a pregnant woman. Check with the blood bank.

Finasteride or dutasteride? Dutasteride blocks more DHT and may work slightly better. It's used off-label for hair, stays in the body much longer, and isn't usually first-line. → Finasteride vs dutasteride

See a doctor soon if you have: round bald patches that appear suddenly · hair coming out in clumps · redness, pain, pus, scaling or scarring on the scalp · hair loss with fever, weight loss, irregular periods, acne or new facial hair · eyebrow or eyelash loss · hair loss in a child.

Sources

1. Kaufman KD, et al. Finasteride in the treatment of men with androgenetic alopecia. J Am Acad Dermatol. 1998;39:578–89.
2. Finasteride Male Pattern Hair Loss Study Group. Long-term (5-year) multinational experience with finasteride 1 mg in the treatment of men with androgenetic alopecia. Eur J Dermatol. 2002;12:38–49.
3. Gupta AK, et al. JAMA Dermatol. 2022;158(3):266–74.
4. Propecia (finasteride 1 mg) prescribing information; Indian product label.

Medical review pending: not yet reviewed by a dermatologist. Medical disclaimer