Finasteride is an anti androgen drug marketed in various brand names by different drug manufactures. The drug acts on the 5-alpha reductase, the enzyme responsible for the conversion of testosterone to dihydrotestosterone. This drug is used in small doses in the treatment of benign prostatic hyperplasia, popularly referred as BPH. The medicine is also found to be effective in high doses for prostate cancer. Further Finasteride in combination with the doxazosin is also treating the symptomatic progression in benign proststic hyperplasia.