Viagra offers me a shorter fuse than typical. Another purpose is that if men are taking nitrates for chest ache, Viagra can cause an unsafe drop in blood strain. The primary drawback to Viagra, which works about an hour after it's taken, it that the FDA cautions men with Coronary heart disease or low blood strain to be thoroughly examined by a physician before obtaining a prescription. Younger males below 20 should not take Viagra without a physician's recommendation and prescription. Take this ...