Within 24 hours of taking propecia, the concentration of dht drops by 65 percent.

Charles decided to start taking propecia, the only fda-approved oral medication for male-pattern baldness.

A 48-week, placebo-controlled study designed to assess by phototrichogram the effect of propecia on total and actively growing anagen scalp hairs in vertex baldness enrolled 212 men with androgenetic alopecia.