Most men using Finpecia 1mg experience no side effects at all. In clinical studies, sexual side effects occurred in less than 2% of men and included decreased sexual desire, difficulty achieving an erection, and decreased semen volume. These effects typically disappear after stopping the medication and often resolve even with continued use. A very small percentage of users may experience allergic reactions, depression, breast tenderness, or testicular pain. If you experience any concerning side effects, consult your doctor promptly. It's important to note that the low 1mg dose of finasteride in Finpecia has a much lower side effect profile than the higher doses used for prostate conditions.