Patients with high blood pressure can take Viagra as an aphrodisiac. Viagra, whose scientific name is sildenafil, is actually also a western drug that is said to be used to treat impotence because it has a vasodilating effect. Sildenafil is a drug that dilates small arteries, and one of the best features of this type of drug is that it can cause a decrease in blood pressure. Patients with hypertension must be evaluated if they are taking Viagra, because most of the time patients with hypertension take drugs like nifedipine, or felodipine, and the probability of postural hypotension will increase dramatically when these drugs are taken at the same time as Viagra. If a patient has to take two vasodilators at the same time, it is recommended that the two drugs be taken separately, such as nifedipine in the morning and Viagra in the evening, to reduce the risk of postural hypotension.