Viagra is the trade name, its generic name is sildenafil, is the treatment of sexual dysfunction drugs; valsartan is not sildenafil, is the treatment of hypertension drugs. 1. Valsartan is an angiotensin II receptor antagonist, inhibiting vasoconstriction by blocking angiotensin II receptors, reducing water and sodium retention, and decreasing ventricular remodeling, so as to achieve the purpose of lowering blood pressure and treating heart failure; it can be used individually, or in conjunction with other medications, for patients with high blood pressure. However, care should be taken not to overdose during the period of taking, to avoid causing hypotension. 2. Sildenafil is a drug for the treatment of erectile dysfunction in men, which can relax the smooth muscle of the penis, increase the blood flow in the cavernous body, the penis is engorged with blood and erectile, so as to achieve the role of the treatment of erectile dysfunction. If you need to take these two drugs or one of the drugs, you should go to a regular hospital, under the guidance of a professional doctor, do not use on your own to avoid adverse reactions.