sildenafil increases effects of prazosin by pharmacodynamic synergism. Steer clear of or Use Alternate Drug. Danger of hypotension; separate sildenafil >25mg from alpha blocker by 4hr.So, Though a thing could be rated an 'A+', overconsumption/overdoing can provide undesired effects. Classification 'B'Coadministration of these phosphodiesterase inhi