Propecia contains finasteride. Finasteride is used for treatment of male pattern hair loss. Its common side effects include sexual dysfunction such as decreased libido, erectile dysfunction, ejaculation disorders including reduced volume of ejaculate, gynaecomastia, testicular pain, hypersensitivity reactions, depression, male breast cancer, and orgasm disorders. Sexual dysfunction is seen in early stage of treatment and it resolves on continued use. Finasteride is very effective in male pattern hair loss. But it side effects are bothersome. It is very difficult to say whether your erectile dysfunction is due to Propecia or it’s a mental erectile dysfunction due to change of place. Anyway, even if it is due to propecia, it will recover slowly when your testestrone level is stabilized in due course of time. Advice 1. Do not use Propecia 2. Avoid smoking, alcohol, and coffee 3. Have patience and give time to yourself for spontaneous resolution 4. Workout in gym at least half an hour daily for 4 – 5 days in a week 5. Take high protein diet such as eggs, meat, fruits, cheese and pulses 6. Investigation a. Serum testosterone Thanks