Treatment tracking
Oral vs topical minoxidil: which works better, and how to tell which is working for you
In the best head-to-head evidence so far, a 2024 randomized trial in men, 5 mg oral minoxidil daily and 5% topical minoxidil twice daily worked about the same over 24 weeks. Oral had an edge on the crown in photo assessment but not in measured hair density. The big difference is side effects and convenience: about half the oral group grew unwanted body or facial hair. Oral minoxidil is prescription-only and off-label for hair.
What the 2024 trial found
Penha and colleagues randomized men with pattern hair loss to either 5 mg oral minoxidil once a day or 5% topical minoxidil twice a day for 24 weeks. 90 men enrolled and 68 completed the study.1
- Main result: similar effectiveness. Differences in terminal and total hair density weren’t statistically significant at either the crown or the front.
- Crown photos: oral did better on photographic assessment of the vertex, a secondary measure.
- Side effects in the oral group: unwanted hair growth elsewhere (hypertrichosis) in 49%, headaches in 14%.
Two cautions. 24 weeks is short for hair, and 5 mg is a higher dose than many prescribers start with for hair loss. The trial is a strong data point, not the final word.
The real trade-offs
| Topical (liquid or foam) | Oral (prescription) | |
|---|---|---|
| Effectiveness | Similar in the 2024 trial | Similar overall; possible crown edge |
| Daily routine | Applied to the scalp once or twice daily; can affect styling | A pill |
| Common issues | Scalp irritation, flaking, greasy feel | Unwanted body and facial hair, headaches; originally a blood-pressure medicine, so it needs a doctor’s oversight |
| Who it suits | People who prefer not to take a pill | People who can’t tolerate the topical or won’t keep up with it |
Honestly, the best minoxidil is the one you’ll actually use every day. Consistency matters more than the form.
Switching from topical to oral
If you switch, expect the clock to partly restart. Changing form or dose can trigger another shed (see minoxidil shedding), and it takes months to judge the result. Don’t change anything else at the same time; if you add finasteride or microneedling in the same month, you’ll never know which change did what.
How to tell which is working for you
Trials report averages; you’re one person. The only way to know whether a switch helped you is to compare yourself before and after:
- Measure before you switch. That’s your baseline on the old routine.
- Change one thing. Just the minoxidil form or dose.
- Measure the same spots every 1–2 months for at least 4–6 months.
- Compare against your control. Hair at the back of the head doesn’t depend on minoxidil, so the treated zones’ thickness as a share of it tells you whether the switch moved anything.
Know whether the switch was worth it
GraftReport tracks hair thickness zone by zone against your own control area. Scan before you switch, then every 1–2 months.
Get the kit — $199How treatment tracking worksCommon questions
Is oral minoxidil better than topical?
In a 2024 randomized trial in men, 5 mg oral minoxidil daily and 5% topical minoxidil twice daily had similar effectiveness over 24 weeks. Oral showed an advantage on the crown in photo assessment, but not in measured hair density.
What are the side effects of oral minoxidil?
In the 2024 trial, 49% of men on oral minoxidil had unwanted hair growth elsewhere on the body or face and 14% had headaches. It is a prescription medicine originally used for blood pressure, so it needs a doctor’s oversight.
Will I shed if I switch from topical to oral minoxidil?
Possibly. Changing the form or dose can trigger another shed, and it takes several months to judge the new routine.
How long does oral minoxidil take to work?
A similar months-long timeline to topical: possible early shedding, earliest regrowth around 2 to 4 months, and fuller results over about a year. Follicles cycle at the same speed however the drug arrives.
Sources
- Penha MA et al. Oral minoxidil vs topical minoxidil for male androgenetic alopecia: a randomized clinical trial. JAMA Dermatol. 2024. PubMed 38598226
- Olsen EA et al. A randomized clinical trial of 5% topical minoxidil versus 2% topical minoxidil and placebo in the treatment of androgenetic alopecia in men. J Am Acad Dermatol. 2002;47(3):377–385. doi:10.1067/mjd.2002.124088
This guide is general information, not medical advice. Hair loss has many causes; see a dermatologist for sudden, patchy or painful hair loss, or before starting or stopping any medication.