From Australia to around the globe
The first publication on low-dose oral minoxidil for hair loss was in December 2017. The pilot study in female-pattern hair loss was published in the International Journal of Dermatology by Rodney Sinclair, MBBS, MD, a Melbourne, Australia–based dermatologist.
Amy McMichael, MD, professor of dermatology at Wake Forest University, Winston-Salem, N.C., said she first heard Dr. Sinclair present his findings at an alopecia research meeting in Japan shortly before his initial publication.
“After that, I think all of us said, ‘Huh, this is interesting, and let’s try it, because we’re always looking for something more to help our patients,’” Dr. McMichael said, adding that she’s been prescribing low-dose minoxidil to her patients for 5 years.
She and colleagues at Wake Forest, along with Jerry Cooley, MD, a dermatologist in private practice in Charlotte, published a retrospective case series in March, looking at 105 adult patients – 80 women (ages 24-80) and 25 men (ages 19-63) – who were treated for androgenetic alopecia and/or telogen effluvium with oral minoxidil (dose range of 0.625–2.5 mg) once daily for a year, matched to 105 case controls.
Efficacy was based on the clinician’s assessment of clinical response and clinical photographic evaluation using a 3-point scale (worsening, stabilization, and improvement). Half of those treated demonstrated clinical improvement and 43% demonstrated stabilization. There was a significant difference (P < .001) in clinical response between those who received minoxidil and the controls.
Ideal patients?
Given its ease of use and low cost – $4-$12 for a 30-day supply of 2.5 mg tablets, according to GoodRX – low-dose minoxidil is a good fit for many patients, said dermatologists.
The best candidate is “a woman who’s perimenopausal or menopausal who’s got what we would say is moderate to severe loss of hair that’s kind of just starting,” said Dr. Simmons-O’Brien. The medication is not likely to grow hair where there is scarring already, however, she said.
“I tend to use it in people who either don’t want to do the topical minoxidil or have used it and have a lot of potential side effects from it,” like itching and irritation, said Dr. McMichael. She said oral minoxidil can also be helpful as an adjunct in patients with alopecia areata and that it can be used after anti-inflammatory treatments in central centrifugal cicatricial alopecia.
Dr. Goldberg said low-dose minoxidil would not be her first choice for female-pattern hair loss but that it’s “a great alternative” for people who can’t tolerate the topical form. Most of the women she has prescribed it to “have been pretty happy,” she added.
“I would be a little cautious in patients on a number of other medications,” Dr. Goldberg said, noting minoxidil’s potential systemic side effects.
Clinicians said they generally consult with a patient’s internist when they are starting them on oral minoxidil. “I always want to touch base with the primary care physician first,” said Dr. Friedman.
“If they’re on oral antihypertensive medications already, then I would ask them to talk to either their primary care physician or their cardiologist to make sure it’s okay to give this low dose,” said Dr. McMichael.
At the low doses, minoxidil rarely has any blood pressure–lowering effects, dermatologists said.
Women are usually started on 1.25 mg, while men can start at a higher, 2.5-mg dose, said clinicians.
Dr. Goldberg and Dr. Simmons-O’Brien said that recent additional warnings for finasteride about sexual side effects and the potential for suicide have changed the way they approach its use in young men, and that it has highlighted the potential for oral minoxidil as an alternative.
Oral minoxidil is rarely used as a monotherapy. “It takes a village” to address hair loss, said Dr. Simmons-O’Brien, noting that she likes to evaluate nutrition, vitamin D levels, and whether a patient is anemic or has thyroid disease when determining a course of action.
Dermatologists said they use oral minoxidil in combination with spironolactone, topical minoxidil, finasteride, or dutasteride. If patients are already on antihypertensives or at risk for excessive blood pressure–lowering effects of a combination that includes spironolactone, the dermatologists said again they will consult with a patient’s primary care physician first.
For women, the main limiting factor with oral minoxidil may be unwanted hair growth, usually on the face. Most of the clinicians interviewed for this story said they did not use spironolactone to counteract that hypertrichosis.
Dr. McMichael said she cautions African American women or women of African descent – who tend to have more body hair at baseline – that they should be aware of the potential for excess hair growth associated with low-dose minoxidil. She and other dermatologists interviewed for this story said they urge patients who are bothered by the excess hair to shave or wax or use other nonpharmacologic approaches.
The excess hair growth is less bothersome for men, they said.