[silnarnin]

Propecia (finasteride 1mg) is the licenced dose for hair loss. Even if you are very accurate breaking into quaters, there's a big risk that yu'll get more or less than 1.25mg.

Finasteride will reduce the synthesis of dihydrotestosterone (DHT) from testosterone. Its seems that the excess of DHT causes male baldness.According to the drug information, no interactions of clinical importance have been found.

From various articles: finasteride lowers the serum concentration of the antigem used to detect prostate cancer. I think there is some debate about what this must mean.

Pop to a pharmacy and speak to the pharmacist. Ask for a yellow form to report adverse reactions. You can report by yourself, you don't need a healthcare professional to do that for you.