the mechanism by which cialis helps relieve symptoms of BPH might be by relaxing the smooth muscle fibers surrounding the urethra. i am not sure if it actually decreases the size of the prostate itself. cialis also relaxes the smooth muscle in the blood vessels supplying the penis. thats how it treats ed.

what is more important is that cialis must not be taken together with other potent vasodilators like nitrates or alpha-blockers. the resulting drop in bp can be so severe as to put people into coma. (not joking)

for anyone with a heart condition, taking nitrates or alpha blockers, dont try this at home