Topical minoxidil therapy for androgenetic alopecia. A 30-month study

In a 30-month study conducted 35 years ago, 72 adult male patients with androgenetic alopecia were treated with 2% to 3% topical minoxidil solution. After four months, all treatment groups showed hair regrowth, which reached its peak at around 12 months. At 30 months, mean hair counts had decreased from the 12-month level but remained higher than baseline counts. Additionally, 70% of patients who continued using the drug for 30 months had 50% or more hairs than when they started the therapy. Some patients even experienced a sustained increase in hair counts after 12 months. No systemic side effects were observed.