Propecia (finasteride) can be prescribed by your doctor for the treatment of male pattern baldness. It's therefore not intended for female patients and should not be taken by them. If a pregnant woman comes into contract with a crushed tablet of Propecia - she must contact a doctor immediately to learn about the options. Finasteride (the active ingredient) can be absorbed through the skin and affect the health of an unborn child. Avoid getting up too quickly, as dizziness is possible in some patients. Make sure you know exactly how Propecia affects you and your reactions. The following side effects are possible when Propecia is taken: swelling in your hands or feet, skin rash, abnormal ejaculation, runny nose, swelling or tenderness in your breasts, dizziness, weakness, pain in the testicles, headache, and impotence. Propecia has not been recommended to cause interactions with any drugs you are taking, but medical conditions you have may be important in determining the dose that needs to be prescribed. Make sure you tell your health care provider before starting the treatment if you have abnormal liver enzyme tests, bladder muscle disorder, liver disease, stricture of your urethra, prostate cancer, inability to urinate or trouble urinating.