Finasteride vs. Minoxidil
See how Finasteride and Minoxidil compare on approved uses, dosing, side effects, and cost.
Key Takeaways
Finasteride is FDA-approved specifically for male pattern hair loss, while oral minoxidil is FDA-approved only for severe hypertension and used off-label, at far lower doses, for hair loss.
Finasteride blocks the hormone DHT that drives hair thinning, while minoxidil widens blood vessels and, at its approved hypertension dose, requires a diuretic and beta-blocker to manage its cardiovascular effects.
Finasteride's main risks are sexual side effects, while oral minoxidil at hypertension doses carries a boxed warning for pericardial effusion.
Finasteride vs. Minoxidil Drug Summary
Finasteride
Finasteride is a 5-alpha-reductase inhibitor that blocks the conversion of testosterone to DHT, the hormone that drives male pattern hair loss. It comes as a 1 mg tablet (Propecia) for hair loss and a 5 mg tablet (Proscar) for enlarged prostate. It is taken once daily by mouth.
Minoxidil
Minoxidil is an oral vasodilator FDA-approved only for severe hypertension that has not responded to other blood pressure medicines. At much lower, unapproved doses, it is prescribed off-label for male and female pattern hair loss. On its approved hypertension dose, it is taken by mouth alongside a diuretic and beta-blocker.
Finasteride vs. Minoxidil Side Effects
Finasteride
Minoxidil
Finasteride vs. Minoxidil Dosage
Finasteride
Minoxidil
| STAGE | DOSE | WHEN |
| Starting dose | 1 mg once daily | At the start |
| Maximum dose | 5 mg once daily | If needed |
| Dose changes | 1 increase | As tolerated |
| STAGE | DOSE | WHEN |
| Starting dose | 5 mg once daily | At the start |
| Maximum dose | 40 mg once daily | If needed |
| Dose changes | 3 increases | As tolerated |
Finasteride
| STAGE | DOSE | WHEN |
| Starting dose | 1 mg once daily | At the start |
| Maximum dose | 5 mg once daily | If needed |
| Dose changes | 1 increase | As tolerated |
Minoxidil
| STAGE | DOSE | WHEN |
| Starting dose | 5 mg once daily | At the start |
| Maximum dose | 40 mg once daily | If needed |
| Dose changes | 3 increases | As tolerated |
Finasteride vs. Minoxidil Indications
Finasteride
Finasteride is FDA-approved for two separate uses at two different doses. The 1 mg dose treats male pattern hair loss, while the 5 mg dose treats symptomatic BPH. It is not approved for use in women or children.
Male pattern hair loss (androgenetic alopecia) in men
Symptomatic benign prostatic hyperplasia (BPH)
Off-label: hirsutism in women with hyperandrogenism
Not approved for women or children
Minoxidil
Minoxidil's only FDA-approved use is severe, symptomatic hypertension that persists despite maximum doses of a diuretic plus two other blood pressure drugs. Its use for hair loss is entirely off-label and relies on much lower doses than those approved for blood pressure. This label does not cover an FDA-approved hair loss dose.
Severe, symptomatic hypertension (FDA-approved)
Off-label: low-dose use for androgenetic alopecia
Not approved for mild-to-moderate hypertension
Not approved as a first-line blood pressure drug
Finasteride vs. Minoxidil Pros and Cons
Finasteride
Finasteride targets the hormonal cause of hair thinning with a single small daily pill and decades of safety data behind it. Its main tradeoff is a real, if uncommon, risk of sexual side effects that some men report continuing after stopping the drug.
Pros
FDA-approved specifically for hair loss in men
Simple once-daily oral tablet
Also lowers DHT linked to prostate growth
Cons
Sexual side effects can persist after stopping
Not safe for women, especially if pregnant
Can lower PSA, masking prostate cancer detection
Linked to increased risk of high-grade prostate cancer
Minoxidil
Minoxidil causes hair growth as a side effect of widening blood vessels, a mechanism completely unrelated to hormones. Because its FDA label reflects hypertension treatment, it must be paired with a diuretic and beta-blocker to offset fluid retention and a fast heart rate. Using it for hair loss means taking a cardiovascular drug off-label without an FDA-approved low dose.
Pros
Works through a non-hormonal mechanism
No known effect on testosterone or DHT levels
Long track record as a blood pressure drug since 1979
Cons
Off-label for hair loss with no FDA-approved dose
Boxed warning for pericardial effusion
Requires a diuretic and beta-blocker to use safely
Can cause tachycardia and fluid retention
Common Symptoms and Related Diseases You Can Explore
Explore a range of common symptoms the Doctronic Symptom Checker can help you understand.