When you have a enlarged prostrate when you take medicine does it shrink the prostrate?

That depends: There are 2 forms of medicine. One that will make the prostate somewhat smaller and another that affects the "tone" of the prostate to allow better flow. There are combination meds as well. Ask your doctor which you are on or should take.

Depends on the med: Medications for BPH commonly fall into two classes, Alpha blockers and 5-alpha reductase (5ar) inhibitors. They may be used alone or in conjunction. Men with larger prostates have been shown to benefit most from the 5ar class of drugs and actual shrinkage of the prostate will occur where as the Alpha blockers do not. Finasteride and Dutasteride are the currently available 5ar drugs.