“Long-term adverse symptoms of men who used oral finasteride against androgenic alopecia have been recently described as post-finasteride syndrome (PFS).” These men report that the sexual side effect after taking finasteride seem to hold for them for long periods of time. The frequency of this finding shows that it is not common as most men who develop the negative sexual side effects of finasteride, return to normal after stopping the medication. The following article recently appeared in the Journal of Sexual Medicine and is worth reading. What it suggests is that there may be differences in the genetic make-up of patients who experience PFS as compared to most others.

http://www.smoa.jsexmed.org/article/S2050-1161(16)30075-7/abstract