Finasteride vs. Minoxidil

Finasteride is a once-daily prescription tablet that lowers DHT, the hormone behind male pattern hair loss, while minoxidil is an over-the-counter foam or solution you apply to the scalp and does not act on DHT. For men, the evidence leans toward finasteride as the stronger single option and toward using both for the best result; for women, minoxidil is the only one of the two with an FDA-approved product, because the Propecia label limits finasteride to men.

• •Form: finasteride (Propecia) is a 1 mg tablet taken once a day; minoxidil is a 5% foam or solution applied to the scalp.
• •Access: finasteride needs a prescription; 5% minoxidil foam is sold over the counter.
• •Who it is labeled for: Propecia is indicated for men only; Men's Rogaine 5% foam is used twice a day, and Women's Rogaine 5% foam once a day.
• •Time to see results: the Propecia label says three months or more of daily use is generally needed; the men's foam label says results may show at 2 months for some and take at least 4 months for others; the women's foam label says 3 months, or at least 6 for some women.
• •If you stop: the Propecia label says the effect reverses within 12 months; the Rogaine labels say hair loss will begin again, and MedlinePlus says most new hair is lost within a few months.
• •Where it works: the minoxidil labels cover regrowth on the top of the scalp, and MedlinePlus notes topical minoxidil does not work on a receding hairline.

How Finasteride Works and What Its Trials Showed

Finasteride blocks 5-alpha reductase, the enzyme that turns testosterone into DHT. The Propecia label reports that a 1 mg dose suppresses serum DHT by about 65% within 24 hours, and that it lowers DHT in both the scalp and the blood. In the label's two studies of men with crown (vertex) hair loss, investigators rated 65% of men on Propecia as having increased hair growth at 12 months versus 37% on placebo, and 80% versus 47% at 24 months. Standardized photos showed an increase in 48% of treated men versus 7% on placebo at 12 months, and 66% versus 7% at 24 months. Hair counts in a one-inch circle were 107 hairs higher than placebo at 12 months and 138 hairs higher at 24 months.

MedlinePlus says you may see no change for at least 3 months, should expect improvement within the first 12 months, and that further treatment probably will not help if nothing has improved by then. Finasteride only works while you take it: hair regrown during treatment is likely to be lost after stopping.

How Minoxidil Works and What to Expect

Minoxidil works on the follicle directly rather than through hormones, so it does not lower DHT. MedlinePlus describes topical minoxidil as a treatment that stimulates hair growth and slows balding, and says it works best in people under 40 whose hair loss is recent. The over-the-counter labels set the routine: half a capful of 5% foam twice a day for men, or once a day for women, applied to a dry scalp in the thinning area. Both labels say using more, or using it more often, will not improve results.

The labels also give a clear point to reassess: the men's foam label says to stop and ask a doctor if there is no regrowth after 4 months, and the women's label says after 6 months. MedlinePlus notes it can take up to a year to see the full effect.

Side Effects and Safety

• •Sexual side effects in the first year of the Propecia trials: decreased libido in 1.8% of men versus 1.3% on placebo, erectile dysfunction in 1.3% versus 0.7%, and ejaculation disorder in 1.2% versus 0.7%.
• •After approval, the label lists reports of sexual dysfunction that continued after stopping treatment, and reports of depression, suicidal ideation and behavior. MedlinePlus says to call your doctor right away about new or worsening depression or breast changes such as lumps, pain or nipple discharge.
• •Finasteride lowers PSA, a prostate cancer screening test, so tell the clinician ordering the test that you take it. The label says 5-alpha reductase inhibitors may increase the risk of high-grade prostate cancer.
• •Women who are or may become pregnant should not handle crushed or broken tablets, according to the label.

• •The most common problems are on the scalp: itching, dryness, scaling, flaking, irritation or burning.
• •Stop and ask a doctor if you have chest pain, a rapid heartbeat, faintness or dizziness, sudden unexplained weight gain, or swelling of the hands or feet. The women's label also lists unwanted facial hair growth.
• •The labels say not to use it if you are under 18, if your hair loss is sudden or patchy, or if you have no family history of hair loss; the women's label adds hair loss linked to childbirth. It may be harmful during pregnancy or breastfeeding.
• •The foam is extremely flammable: avoid flames and smoking while applying it and right after.

Is Using Both Better Than Either One?

Because the two drugs work in different ways, they are often prescribed together. The clearest head-to-head data come from a 2015 randomized study in Dermatologic Therapy: 450 Chinese men with male pattern hair loss took 1 mg finasteride daily, used 5% topical minoxidil, or did both for 12 months. Among the 428 men evaluated, improvement was reported in 80.5% of the finasteride group, 59% of the minoxidil group and 94.1% of the combination group. Adverse reactions were reported in 1.8% of men on finasteride and 6.1% on minoxidil and went away after stopping. This is one trial in one population, so treat it as support for the combination rather than a promise of a specific result, and talk to a clinician about whether both suit you.

What About Topical Finasteride and Minoxidil Sprays?

Several telehealth companies sell compounded sprays that mix finasteride and minoxidil in one bottle. The FDA states there is no FDA-approved topical form of finasteride, and compounded versions have not been evaluated by the FDA for safety, effectiveness or quality. The agency counted 32 adverse event reports from 2019 to 2024, including erectile dysfunction, decreased libido, anxiety, depression and suicidal ideation, most of which were reported to continue after stopping. It also warns that the product can transfer to other people, especially women. The trial results above come from finasteride tablets and minoxidil solution, not from these sprays.

• •Men with crown thinning who are open to a prescription: finasteride has the stronger single-drug data; ask about sexual side effects and PSA testing first.
• •Men who want to avoid a hormone-acting drug or start without a prescription: 5% minoxidil foam twice a day, with a check at 4 months.
• •Women with pattern thinning: 5% minoxidil foam once a day is the FDA-labeled option; finasteride is not indicated for women and must be avoided in pregnancy.
• •Men already on one drug with partial results: the 2015 trial supports asking a clinician about adding the other.
• •Sudden, patchy or postpartum hair loss, or no family history: see a clinician before using either, since the minoxidil labels exclude these cases.

Quick Answers

• •Which works better, finasteride or minoxidil? For men, the 2015 trial found more improvement with finasteride (80.5%) than 5% minoxidil (59%), and the most with both (94.1%).
• •Which works faster? Both take months. Propecia generally needs three months or more; some men see minoxidil results at 2 months and others need 4 or more.
• •Can women take finasteride? Propecia is labeled for men only and is contraindicated in women who are or may become pregnant. Women's 5% minoxidil foam is FDA-labeled for women.
• •Do I have to use them forever? To keep the results, yes. Both labels say the benefit fades after stopping.
• •Does minoxidil regrow a receding hairline? MedlinePlus says topical minoxidil does not work for a receding hairline; the labels cover the top of the scalp.