PharmaceuticalVasodilatorPotassium-channel openerHair-growth agent

Minoxidil

Also known as Rogaine · Regaine · LDOM (low-dose oral minoxidil)

Written by enwyReviewed 15 Jul 20261 sources0 comments

Minoxidil is a vasodilator repurposed as the leading topical hair-loss treatment, also used off-label at low oral doses. It is not an anti-androgen but is the standard companion to 5ARIs and AR antagonists, promoting hair growth by prolonging the follicle growth phase. Oral use adds cardiovascular and fluid-retention considerations.

01 Overview

Originally an oral antihypertensive, minoxidil's hair-growth side effect led to topical formulations (Rogaine) approved for androgenetic alopecia in both sexes. In recent years low-dose oral minoxidil (LDOM) has become popular off-label for greater convenience and efficacy.

Topical minoxidil is well tolerated aside from local irritation and unwanted facial hair; oral use requires attention to blood pressure, heart rate, and fluid retention. It is mechanistically complementary to DHT-blocking drugs and often combined with them.

02 Mechanism

As the active sulfated metabolite, minoxidil opens ATP-sensitive potassium channels and acts as a vasodilator, prolonging the anagen (growth) phase of hair follicles and enlarging miniaturised follicles; it does not affect androgens.

03 Dosing

Tier	Dose	Route	Notes
Low-dose oral (off-label)	0.625–5 mg/day	Oral	LDOM 0.625-5 mg/day off-label for hair loss
Topical	2–5 %/day	Transdermal	5% foam/solution once or twice daily to the scalp

04 Effects

Effect	Magnitude	Evidence
Increased hair growthIncreases hair count and thickness in androgenetic alopecia; prolongs the growth phase.	Significant vs placebo	Clinical
Synergy with anti-androgensComplements finasteride/dutasteride by acting through a non-hormonal mechanism.	Additive	Clinical

05 Side effects

Effect	Severity	Frequency	Evidence
Unwanted facial/body hair (hypertrichosis)Excess hair growth on the face or elsewhere, more common with oral use.	Mild	Common	Clinical
Fluid retention / edema (oral)Ankle swelling and fluid retention, mainly with oral dosing.	Moderate	Uncommon	Clinical
Tachycardia / palpitations (oral)Increased heart rate or palpitations with oral use.	Moderate	Uncommon	Clinical

06 Legal status

United States

OTC (topical) / prescription (oral)

Topical is OTC; oral minoxidil is a prescription drug used off-label for hair · as of Jan 2026

OTC topical / prescription oral

Varies by market · as of Jan 2026

07 References

Low-dose oral minoxidil for the treatment of androgenetic alopeciaJournal of the American Academy of Dermatology, 2021

08 Discussion0 comments

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This page is reference information, not medical advice. Doses and protocols are documented as they appear in the clinical literature and in practice — describing them is not a recommendation to use them. Countermeasures listed here are not a substitute for a physician. Legal status varies by jurisdiction and changes.