Q: I have been on Propecia for a year and my hair loss has not stopped or slowed down. How much longer should I give the drug? Can Propecia speed up hair loss in some patients? — N.V., East Hills, N.Y.
A: If you have not responded to Propecia in one year, it is unlikely that you will.
Finasteride may cause shedding in the first 6 months of treatment, but should not accelerate hair loss long-term. It is most likely that you have progression of your hair loss.
In addition, be sure that you have a correct diagnosis i.e. that you actually have androgenetic alopecia.