In 1992, Merck introduced a revolutionary drug finasteride (Proscar). This drug was the first drug introduced that reduces the size of the prostate, rather than treating the symptoms (like doxazosin and tamsulosin do). By reducing the volume of the prostate, the tension on the urethra caused by the enlargement of the gland is diminished and symptoms as a result of prostatic enlargement are diminished. Symptoms do not dissipate immediately when using this drug, but rather it takes 6-12 months...

