Minoxidil (topical): uses, strength, evidence, and side effects

At a glance

U.S. status

OTC drug (U.S.)

Jobs

Pattern hair loss · Maintaining density · Beard and brow use (off-label)

Watch for

Shedding in the first 4–8 weeks is expected, and stopping reverses the gains. The 5% foam is the standard; oral low-dose minoxidil is a separate prescription trend.

Access

Generic foam and solution are inexpensive; subscription telehealth brands sell the same drug at a markup.

Forms and strengths

2% and 5% solutions and 5% foam (OTC drug)
Compounded higher strengths and combinations (Rx)
Oral low-dose tablets (Rx, off-label for hair)

How to use it

Apply to a dry scalp once (foam) or twice (solution) daily and leave for at least 4 hours; judge at 4–6 months and continue indefinitely.

Side effects and cautions

Initial shedding
Scalp irritation (often from propylene glycol in solutions)
Unwanted facial hair with drips

Get advice first if

Not recommended in pregnancy or breastfeeding. Keep away from pets, especially cats. Oral minoxidil requires prescriber monitoring for blood pressure and fluid retention.

Regulatory status

FDA-approved OTC drug for hair regrowth; oral minoxidil is approved only for blood pressure and used off-label for hair.

In the trends

Oral minoxidil went viral in 2022–2024; the topical remains the evidence-based starting point.

Sources on file

These links support the claims above. Reviewed September 1, 2026. Drug labels link to DailyMed searches so the current label is always one click away.