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FDA approved Skin and Hair

Minoxidil

Also called Rogaine (topical); Loniten (oral); low-dose oral minoxidil

A hair-growth medicine used on the scalp (Rogaine) or, more and more, as a low-dose daily pill. Works for both men and women.

Overview

What it is

A small molecule, not a peptide. Topical 2% and 5% minoxidil are FDA approved over the counter for hair loss. Minoxidil tablets are FDA approved for severe high blood pressure and are prescribed off-label at much lower doses for hair loss.

How it works

Minoxidil opens potassium channels and widens blood vessels. In hair follicles it lengthens the growth (anagen) phase and enlarges shrunken follicles. Scalp enzymes convert it to its active form, minoxidil sulfate.

What the research shows

Topical minoxidil has decades of placebo-controlled evidence in men and women. Low-dose oral minoxidil (usually 0.25 to 5 mg a day) has become common since about 2020. A 2024 randomized trial in men found 5 mg oral minoxidil performed about as well as 5% topical minoxidil over 24 weeks. Shedding in the first 2 to 8 weeks is common and temporary.

Studied for

  • Male and female pattern hair losstopical, FDA approved OTC
  • Hair lossoral, off-label low dose
  • Severe high blood pressureoral, FDA approved

Safety and regulatory status

Safety and side effects

Topical: scalp itching, dryness and unwanted facial hair. Oral: unwanted hair growth on the face or body is most common; fluid retention, ankle swelling, fast heart rate and dizziness can occur. The full-dose oral label carries a boxed warning for fluid around the heart (pericardial effusion) and worsening angina. Not for use during pregnancy. Toxic to cats, even in small amounts from topical products.

Regulatory status

FDA approved: topical for hair loss (over the counter), oral tablets for severe hypertension. Oral use for hair loss is off-label.

Common questions

Pill or topical?

Pills are easier and avoid scalp irritation; topical keeps body exposure lower. Studies so far show similar hair results.

Why is my hair shedding at first?

Minoxidil pushes resting hairs out to make room for new growth. The shed usually stops within 2 months.

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Sources and further reading (3)
  1. Minoxidil tablets, FDA prescribing information.
  2. Penha MA, et al. Oral minoxidil vs topical minoxidil for male androgenetic alopecia: a randomized clinical trial. JAMA Dermatol, 2024.
  3. PubMed: low-dose oral minoxidil for hair loss, reviews.
Educational information only. This content summarizes published research for general education. It is not medical advice, not a recommendation to use any substance, and not an instruction for human or animal use. It does not describe any Research Product sold on this site.