Oral Minoxidil vs Topical Minoxidil: Cost and Access Head-to-Head

Do you need a prescription for minoxidil?

For the standard topical product, no. Topical 2% and 5% minoxidil products are available over the counter, and the Rx-to-OTC switch for the 2% solution was approved on 9 February 1996 [1].

For the tablet, yes. The Loniten application (NDA 018154) was approved on 18 October 1979, and the 2.5 mg and 10 mg Loniten tablets are marked discontinued in Drugs@FDA, with an FDA determination that this was not for safety or effectiveness reasons. Generic minoxidil tablets remain on the market [2].

What is each form approved to do?

The men's 5% solution is labeled for the top of the scalp (vertex) only, for men only, and is not intended for frontal baldness or a receding hairline; the directions are 1 mL with the dropper twice a day, and continued use is necessary or hair loss begins again [6]. The women's 5% foam label directs half a capful once daily; results may occur at 3 months, and some women may need 6 months [7].

The oral tablet is approved only for hypertension that is symptomatic or associated with target organ damage and is not manageable with maximum doses of a diuretic plus two other antihypertensive drugs, and use in milder hypertension is not recommended. The label also states that use of minoxidil tablets, in any formulation, to promote hair growth is not an approved indication [3].

What comes with an oral prescription

The oral label carries a boxed warning: minoxidil is a powerful antihypertensive that can cause pericardial effusion, occasionally progressing to tamponade, and can exacerbate angina. The label says it must be given under close supervision, usually with a beta blocker and a diuretic [3]. The labeled contraindications are pheochromocytoma and hypersensitivity to any component [3]. For patients over 12, the labeled hypertension dosing starts at 5 mg daily and is usually effective at 10 to 40 mg/day [3]. The hair-loss doses tested in the comparative trials below were 5 mg/day [5] and 1 mg/day [8]. These are off-label uses, and the 1 mg dose is far below antihypertensive dosing.

Generics and compounded versions

• Topical products include over-the-counter generics [1].
• Oral tablets are prescription-only [3].
• Compounded versions are not FDA-approved, and FDA does not verify their safety, effectiveness or quality before they are marketed [4]. The oral tablet label also says compounded topical minoxidil formulations have not been shown to be safe or effective [3].

Do the two forms work the same?

One double-blind trial compared oral minoxidil 5 mg daily with topical 5% solution 1 mL twice daily for 24 weeks in 90 men aged 18 to 55 with androgenetic alopecia at a single clinic in Brazil; 68 men completed the study. The between-group differences in terminal hair density were not statistically significant [5].

A second randomized trial of 65 patients compared topical 5% solution with oral minoxidil 1 mg/day for 6 months. Both groups improved hair diameter (P<0.001) with no significant difference between them [8].

Bottom line

Topical 2% and 5% minoxidil is available without a prescription and is approved for hair regrowth on the labeled areas [1][6]. Oral minoxidil is a boxed-warning antihypertensive that is off-label for hair loss and requires a prescriber [3]. Neither randomized comparison found a statistically significant difference between the two forms on the outcomes described [5][8].