Propecia (finasteride) belongs to the class of medicines called 5-alpha reductase inhibitors and can be prescribed by your health care provider to treat male pattern hair loss in case you have been diagnosed with this condition. Before you start the treatment it's necessary to discuss it with your health care provider. Propecia is a treatment, but not a cure - so it is not going to be efficient if you stop taking it. Therefore, it's crucial that you make sure you are ready for the long-term treatment and will not have to stop taking Propecia suddenly. If there are any medications you are panning to take, including prescription and over-the-counter drugs, herbal preparations, vitamins of supplements they need to be reported to your health care provider. Propecia should be taken by males only and pregnant women should not handle the crushed tablets of Propecia as otherwise the active ingredient can get absorbed through skin causing birth defects in unborn male babies. If a pregnant woman happens to touch a crushed tablet of Propecia make sure this is reported to a qualified professional to make sure the baby will not be harmed. It is also a good idea to wash the area that contacted the active ingredient with some soapy water to prevent more medicine from getting absorbed. Although most patients report no side effects at all, here is a list of minor side effects that are sometimes experienced when taking Propecia: runny nose, weakness, impotence, abnormal ejaculation, swelling in your limbs, skin rash, headache, pain in the testicles, breast tenderness, feeling like you might faint, and dizziness.