People with heart conditions should never take ED medications without consulting a doctor. Experts recommend that you stop taking the drug if you don’t notice an improved sex drive after eight weeks. Do not take more or less of it or take it more often than prescribed by your doctor. If you’re experiencing changes or difficulties with sexual function, talk to your health care provider. Continue to take sildenafil even if you feel well.Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the . AdBrowse & discover thousands of brands. Read customer reviews & find best sellers. Find deals and low prices on popular products at test1.ru1M+ visitors in the past month. The recommended dosage of Viagra for erectile dysfunction (ED) is 50 mg, taken as needed about 1 hour before sexual activity. You can take it 30 minutes to 4 hours before sexual activity. And you.