Propecia vs. Minoxidil

See how Propecia and Minoxidil compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Propecia is FDA-approved specifically for male pattern hair loss, while oral minoxidil is approved for severe hypertension and used off-label, at low doses, for hair loss.

  • Propecia works by lowering DHT, the hormone that shrinks hair follicles, while oral minoxidil widens blood vessels and grows hair as a side effect of that action.

  • Oral minoxidil carries a boxed warning for pericardial effusion and usually needs a diuretic and beta-blocker, while Propecia's main risks are sexual side effects.

Propecia vs. Minoxidil Drug Summary

Propecia

Propecia (finasteride) is a 5-alpha-reductase inhibitor that treats male pattern hair loss by lowering DHT, the hormone that shrinks hair follicles. It comes as a 1 mg tablet taken once daily and is FDA-approved specifically for this use in men.

Minoxidil

Minoxidil is a vasodilator FDA-approved in 1979 for severe hypertension, taken as an oral tablet titrated from 5 mg up to 40 mg daily. At much lower doses, it is used off-label for male and female pattern hair loss, though the FDA has not approved it for that use.

Propecia vs. Minoxidil Side Effects

Propecia

Most common
Decreased libido (1.8%)
Erectile dysfunction (1.3%)
Decreased ejaculate vol. (1.2%)
Ejaculation disorder (1%+)

Minoxidil

Most common
Hypertrichosis (up to 80%)
Pericardial effusion (3% to 5%)
Tachycardia (reflex effect)
Fluid retention/edema (common)

Propecia vs. Minoxidil Dosage

Propecia

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 1 mg once daily At the start
Maximum dose 1 mg once daily Same as starting
Dose changes None Fixed dose

Minoxidil

Dosage
Dosage Table
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

Propecia vs. Minoxidil Indications

Propecia

Propecia is FDA-approved to treat androgenetic alopecia, or male pattern hair loss, in men. It works by blocking the conversion of testosterone to DHT, the hormone responsible for shrinking hair follicles at the scalp. It is not approved for use in women or children.

  • FDA-approved for male pattern hair loss

  • Taken as a 1 mg tablet once daily

  • For men only, not approved for women

  • Works by lowering scalp DHT levels

Minoxidil

Oral minoxidil is FDA-approved only for severe, treatment-resistant hypertension, not for hair loss. At much lower doses than the hypertension regimen, it is prescribed off-label for male and female pattern hair loss because it causes hair growth as a side effect. This hair loss use has not been reviewed or approved by the FDA.

  • FDA-approved for severe hypertension only

  • Hair loss use is off-label, low-dose

  • Used in both men and women off-label

  • Causes hair growth as a side effect

Propecia vs. Minoxidil Pros and Cons

Propecia

Propecia is the only oral medication FDA-approved specifically for male pattern hair loss, with decades of safety data since 1997. Its main drawbacks are sexual side effects and handling restrictions for women who are or may become pregnant.

Pros

  • Only FDA-approved oral drug for hair loss

  • Simple once-daily 1 mg dosing, no titration

  • No cardiovascular monitoring required

Cons

  • Not approved for use in women

  • Risk of sexual side effects, some persistent

  • Costs roughly $100 to $250 per month before savings

  • May raise risk of a more aggressive prostate cancer

Minoxidil

Oral minoxidil's hair growth effect is a side effect of a blood pressure drug, so its use for hair loss is entirely off-label rather than purpose-built. It also requires closer cardiovascular management, including a boxed warning for pericardial effusion.

Pros

  • Costs roughly $15 to $40 per month before savings

  • Can be used off-label in both men and women

  • Widely available as a low-cost generic tablet

Cons

  • Not FDA-approved for hair loss at all

  • Boxed warning for pericardial effusion

  • Usually requires a diuretic and beta-blocker

  • Multiple titration steps up to 40 mg daily

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