Propecia (finasteride) can be prescribed if you keep losing your hair, especially in the vertex and the anterior mid-scalp area. It works by interfering with the process of conversion of testosterone to dihydrotestosterone (DHT) - through tot be responsible for premature hair loss. This drug will need to be taken regularly for you to benefit from taking it. Once you stop taking Propecia - all the hair you managed to are-grow will be lost within one year. Propecia can sometimes cause some side effects that can be quite different and vary in intensity, but in most cases go away on their own. The following ones may occur: pain in the testicles, weakness, runny nose, headache, impotence, dizziness, swelling or tenderness in your breasts, skin rash, abnormal ejaculation, and swelling in your hands or feet. There is no need for you to report them unless they get bothersome or severe. Never share your dose of Propecia with other people to whom it was not prescribed. This drug has not been reported to cause interactions with other meds you are using, but you will still need to report to your health care provider any prescription or over-the-counter medications, as well as vitamins, herbal supplements or minerals you are going to use and combine with Propecia.