Side effects of generic Finasteride drug can include itching and rashes, and allergic reactions causing a swelling of the lips and face. It can also cause problems with ejaculation, tenderness and possible enlargement of the breasts and testicular pain. Some men have reported a lower sex drive and more difficulty getting an erection. Only a small percentage of men reported problems though. If side effects were present, they went away after stopping the use of the drug.