Propecia (finasteride) is a highly-efficient treatment intended for patients that lose hair too early (some men can start losing hair in their early twenties). It has to do with high amounts of dihydrotestosterone in the body - and Propecia works to prevent the conversion of testosterone to dihydrotestosterone. Every tablet of Propecia is coated to prevent the active ingredient from being released. Pregnant women or those that may become pregnant should not be allowed to handle crushed tablets of Propecia, as this medicine can be absorbed through their skin. If a pregnant woman happened to come into contact with a crushed tablet of Propecia, the area affected must be washed with warm soapy water before contacting the doctor and asking him for professional advice. If you ever had an allergic reaction to finasteride or dutasteride, tell your doctor about that in advance as the chances of an allergic reaction when taking Propecia are high enough. Let your doctor know if you have any of the following conditions: liver disease, stricture of the urethra, bladder muscle disorder, prostate cancer, inability to urinate, or any others that may interfere with the treatment. Any other medical conditions you have or used to have must also be reported to provide for higher efficiency and increased safety of your treatment. You need to be aware of the possibility of developing some mild side effects as a result of using Propecia. The following ones have been reported by some patients using this medicine: trouble having an orgasm, swelling or tenderness in your breasts, dizziness, pain in the testicles, swelling in your hands or feet, abnormal ejaculation, headache, loss of interest in sex, weakness, impotence, skin rash, and runny nose. If you are using Propecia for hair loss, you will need to be taking it for as long as you want to have some result. Once you stop taking Propecia regularly - all the progress achieved will be lost within a one year period. Up to three months may be required for you to see the first results of your treatment. However, if after 12 months of taking Propecia you do not notice any results - it's safe to assume this drug will not be efficient for you. In some rare case this drug can cause male breast cancer. If you develop any changes in the breasts, make sure you tell your health care provider about it as soon as possible. Please tell your health care provider if you are currently taking any prescription and nonprescription medications, herbal products, vitamins, or nutritional supplements, as interactions are theoretically possible. Never take more of Propecia than recommended, as this is not likely to make this drug more efficient. Although an overdose of Propecia is not expected to produce any health effects that are serious or life-threatening, such cases need to be reported to your health care provider. Make sure you always throw away any Propecia past its expiry period. Taking it after this period is not likely to bring you any benefits and can even cause harm.