As with all prescription drugs Propecia has several side effects that you should be aware of and discuss in great detail with your physician before taking Propecia. Some of the most serious side effects include trouble breathing, hives, swelling in your throat, face or lips. If any of these side effects of Propecia happen you need to immediately contact emergency medial assistance.
There are also several other less serious effects of Propecia that you need to watch out for such as pain in the groin or testicles, swelling in the legs or arms, nausea, feeling like you are about to faint or fainting, inability to gain or maintain an erection or achieve an orgasm. If you notice any of these side effect you should contact your physician.