Propecia (finasteride) is a medicine that you can be prescribed if you are losing hair although you are too young for it. This is called male pattern hair loss and it can affect men as young as in their twenties. Propecia works by interfering with a specific hormone in your body, making sure you can grow hair on the bald spots. Propecia is not a cure rather than a treatment - it will need to be taken regularly for you to re-grow your hair. No matter how long you have been using this medicine for - all the progress will be lost within a one-year period. Keep taking Propecia for as long as recommended or for as long as you want to re-grow the hair on your bald spot. Your health care provider is supposed to know whether you are taking any other medications or whether you have such medical conditions as inability to urinate or trouble urinating, bladder muscle disorder, liver disease, abnormal liver enzyme tests, stricture of your urethra, or prostate cancer. Those factors can affect the success of your treatment and need to be reported. Propecia mild side effects are not too common and can include the following ones: swelling in your hands or feet, impotence, dizziness, headache, abnormal ejaculation, swelling or tenderness in your breasts, runny nose, pain in the testicles, weakness, and mild skin rash.