Finasteride
A daily tablet that lowers DHT, the hormone behind male pattern hair loss. It is better at keeping the hair you still have than at bringing back hair that is gone.
Key facts
Finasteride at a glance.
Used for
Male pattern hair loss
Results
Early changes: 3–6 months
Treatment commitment
Daily, ongoing
Key precautions
Pregnancy: do not handle broken tablets
What is it?
Top things to know about Finasteride
- It lowers DHT. Finasteride blocks type II 5-alpha-reductase.
- It slows follicle shrinkage. It can improve hair measures in susceptible follicles.
- It has limits. It does not treat every cause of shedding or create new follicles.
- Pregnancy exposure is a risk. It can harm the development of a male fetus.
Often used for
What Finasteride is used for
HOW IT WORKS
How Finasteride works
Diagram explanation and sources
Reduces DHT production: Blocks 5-alpha reductase, which converts testosterone to DHT. Slows follicle shrinkage: Less DHT reduces the signal that miniaturizes susceptible follicles. Supports hair growth: More hairs enter the growing phase over time.
Oral finasteride for androgenetic scalp hair loss. The main target shown is type II 5-alpha reductase. Finasteride reduces DHT production; it does not block androgen receptors. The larger follicle is a conceptual illustration of growth support, not a guaranteed transformation or creation of new follicles.
Brands
Brands of Finasteride
Brand names and available preparations vary by country. The examples below identify specific labeled products.
Propecia
Finasteride tablets labeled for male pattern hair loss.
Proscar
Finasteride tablets labeled for an enlarged prostate. It is a different product and strength from Propecia.
Strengths
Finasteride strengths
Oral finasteride has different labeled strengths for different indications. The approved male-pattern hair-loss regimen uses 1 mg once daily; a 5 mg prostate tablet is not a stronger hair-loss step. Topical finasteride is a separate formulation and dosing question.
1 mg
5 mg
The U.S. finasteride 1 mg label uses one tablet daily for men with androgenetic alopecia.
A different labeled indication. Splitting or other off-label use requires a prescriber; the tablet is not an automatic upgrade for hair loss.
Strength sources
Forms
Finasteride forms
Tablet
A solid oral form. Size, coating and ease of swallowing vary by product.
Spray
A liquid applied as droplets or mist, useful through hair or over larger areas. Some solvent-based formulas can sting or feel drying.
How to use it
Your treatment, step by step.
How to take it
- 01
When to take it
Any time of day, with or without food. Attach it to something you already do — two weeks of forgetting is what ruins this drug, not a bad day. Do not split or crush the 1 mg tablet.
- 02
If you miss a dose
Take it when you remember, or skip it. Never take two at once. One missed tablet makes no difference. A missed month does.
Monitoring & follow-up
No routine blood tests are needed for a healthy man taking 1 mg for hair loss. The honest monitoring is photographs — same spot, same light, every few months, because slow change is invisible day to day.
One number does change. Finasteride roughly halves PSA, the prostate blood test. It does not hide a problem, but the result has to be read knowing you are on it, so tell any doctor who orders one. Nothing needs checking on a schedule; the recurring question is whether you still want to take it.
What to expect
How things change over time.
Starting
Nothing visible. Some men shed more at first as short, weak hairs are replaced. Uncomfortable to watch, and it settles.
Turning
Shedding slows, and a lower shed rate is often the first sign it is working. Hair feels thicker in the hand before it looks thicker. Sexual side effects, if they happen, show up here.
Regrowth
Regrowth appears if it is going to, mostly at the crown and mid-scalp, fine at first and then thickening. Nearly all measured regrowth happens here.
Judge it here
If your hair has simply held, that is a result — holding is what this drug does best. Trials counted more hairs at one year on the drug and fewer on placebo — part of the difference is loss that did not happen.
- Months 1 to 3
- Months 3 to 6
- Months 6 to 12
- After 12 months
When you stop
There is no taper and no withdrawal. DHT returns to its previous level within days to weeks.
Hair follows more slowly. What you kept because of the drug is lost over about six to twelve months, leaving you roughly where you would have been anyway. Nothing ends up worse than baseline.
What it Pairs with
Finasteride + your routine
| Product or situation | With Finasteride | What to know |
|---|---|---|
| Broken tablets near a pregnancy | Avoid | The coating prevents skin contact. Finasteride can affect how a male baby's genitals develop, so anyone pregnant or who could become pregnant should not handle a broken tablet. Intact tablets are fine to touch. |
| Splitting 5 mg tablets in a shared house | Avoid | The same problem, self-inflicted. If cost is the reason, ask for generic 1 mg instead. |
| Donating blood too soon after stopping | Avoid | Wait about a month, so a recipient who is pregnant is not exposed. |
| Judging it in the first three months | Avoid | Nothing to see yet, and an early shed reads as failure when it is not. |
| Stopping for a week to see what happens | Avoid | A week off tells you nothing, and stop-start use gives you the side effect risk with less of the benefit. |
| If you are trying to conceive | Use care | Semen volume or sperm count drops in a minority of men and generally reverses. Raise it before you start. |
| If your partner could be pregnant | Avoid | Ask how tablets are stored at home, and do not split them. |
| If you are a woman considering it | Use care | Not approved for women, and not used in anyone who could become pregnant. It needs a real conversation, not a borrowed prescription. |
| If you are due a PSA test | Use care | It runs about half what it otherwise would, and whoever reads it needs to know. |
| If your mood drops | Use care | Mood changes are reported and on the label in some countries. Do not wait it out. |
| If you notice breast changes | Use care | Uncommon, but get it examined. |
| If you already take dutasteride | Use care | They do the same job and are not combined. |
| If you have liver disease | Use care | The liver processes this drug, so it changes the conversation. |
Side effects & when to get help
Most men notice nothing. The sexual effects are the ones people ask about, and they affect a small minority.
Common
Lower sex drive
Trouble getting an erection
Less semen: The volume, not the sperm count.
Breast tenderness
Tell your doctor
Sexual effects that do not settle after stopping
Low mood or loss of interest in things: Raise it rather than sitting with it.
A breast lump, pain or nipple discharge: Needs looking at.
A PSA test coming up: Finasteride roughly halves the result. Tell whoever reads it.
Stop and get care
Hives, facial swelling or trouble breathing: A true allergic reaction is rare.
Getting it and cost
Getting Finasteride.
Cost & access
Generic finasteride 1 mg is inexpensive and widely stocked — one of the cheaper long-term prescriptions in dermatology. Branded Propecia costs considerably more for the same drug.
What affects the cost
Telehealth subscriptions bundle the tablet with shipping and a consultation — convenient, and usually more per month than a local generic. Insurance often does not cover it, because hair loss counts as cosmetic, so most people pay cash.
Alternatives
Other options to consider.
Topical minoxidil
The other mainstream option, and the two work on completely different things, one on the hormone and one on the hair cycle. Good evidence, and they are commonly used together rather than instead of each other.
Oral minoxidil at low dose
Off-label and prescription only. Often more effective than the liquid for people who cannot keep up a twice-daily routine, with a different set of side effects including unwanted body hair.
Dutasteride
Blocks both forms of the enzyme, lowers DHT further, and in head-to-head trials regrew somewhat more hair. Off-label in the United States, and it stays in the body far longer, so a side effect takes much longer to clear.
Topical finasteride
Less reaches the bloodstream, which is the whole appeal. Products are not standardized, absorption still happens, and the evidence base is small.
Ketoconazole shampoo
For a small effect on hair, solid evidence for treating a flaky scalp. Reasonable as an add-on, not as a treatment.
Hair transplant
Moves follicles that are not sensitive to DHT into the areas that are. It is the only option that addresses bare scalp, and it is usually done alongside finasteride so the untransplanted hair does not keep thinning around it.
Questions
Questions you might be asking.
How long before I know if it is working?
Six months for the first honest look, twelve for the verdict. Photographs make that possible.
Do I have to take it forever?
As long as you want the effect. Stopping puts you back on your old path within six to twelve months.
Are the sexual side effects permanent?
For almost everyone they do not happen or they resolve. A minority report symptoms that persisted after stopping, and research has neither confirmed nor ruled that out. Worth discussing before you start.
Can my partner touch the tablets?
Whole, coated tablets are fine. Broken or crushed ones should not be touched by anyone pregnant or who could become pregnant.
Is my hair falling out more since I started?
It can, in the first weeks, as weak short hairs are replaced. It usually settles by month three. Still climbing at four months, get it looked at.
Can I take it with minoxidil?
Yes, a common pairing. They work on different parts of the problem, so the effects add up.
Related
Keep exploring.
Dutasteride
Female Pattern Hair Loss
Topical Minoxidil
Male Pattern Hair Loss
Alopecia Areata
Hair Transplant
Telogen Effluvium
Dutasteride vs Finasteride
Finasteride vs Topical Minoxidil
Finasteride vs Oral Minoxidil
Finasteride vs Spironolactone