Why doesn't minoxidil work the same for everyone?

If minoxidil worked for your friend but not for you, the medicine isn't necessarily the problem. People really do respond to minoxidil differently — this article explains why, one reason at a time.

1. Genetics and the follicle's enzymes

To work, minoxidil has to be converted inside the hair follicle into its active form, minoxidil sulfate. Sulfotransferase enzymes (SULT1A1) do this, and people have different amounts of them. In a study of women with hereditary hair loss, measuring this enzyme's activity in plucked hairs predicted the response to minoxidil quite accurately.

2. Not all hair loss is alike

Minoxidil works much better for hereditary hair loss (androgenetic alopecia) than for some other types. If your hair loss has another cause — deficiencies or hormonal changes, for example — minoxidil alone won't give the result you want until that cause is treated. That's why the cause should be found before treatment starts.

3. When you start matters

The healthier the follicles, the better the chance of a response. Hereditary hair loss doesn't wait; treatment started earlier usually works better.

4. Regular use and patience

One of the most common reasons for no result is irregular use or stopping too early. The first changes usually take several months, and shedding sometimes even increases in the first weeks — don't take that as a sign the medicine isn't working.

5. Sometimes minoxidil alone isn't enough

For some people, adding other treatments — as the doctor decides — can improve the result:

• Microneedling: in a randomised study, weekly microneedling plus minoxidil worked better than minoxidil alone.
• PRP (platelet-rich plasma): systematic reviews of clinical trials show increased hair density with PRP, although the quality of the studies varies.
• Finasteride: an oral medicine used only on a doctor's prescription and supervision, and not suitable for everyone — especially women of childbearing age.
• Retinoids: tretinoin may increase the activity of the enzyme that activates minoxidil — we explain it fully in the article "Retinoids alongside minoxidil".

References

• Roberts J, Desai N, McCoy J, Goren A. Sulfotransferase activity in plucked hair follicles predicts response to topical minoxidil in the treatment of female androgenetic alopecia. Dermatologic Therapy, 2014 — pubmed.ncbi.nlm.nih.gov/24773771
• Dhurat R, et al. A randomized evaluator blinded study of effect of microneedling in androgenetic alopecia: a pilot study. International Journal of Trichology, 2013 — pmc.ncbi.nlm.nih.gov/articles/PMC3746236
• Is autologous platelet-rich plasma capable of increasing hair density in patients with androgenic alopecia? A systematic review and meta-analysis of randomized clinical trials, 2024 — pmc.ncbi.nlm.nih.gov/articles/PMC11551241
• Sharma A, et al. Tretinoin enhances minoxidil response in androgenetic alopecia patients by upregulating follicular sulfotransferase enzymes. Dermatologic Therapy, 2019 — doi.org/10.1111/dth.12915