Brand names Why is this medication prescribed? Shipping: Discreet, fast shipping is a must. What special dietary instructions should I follow? Sexual activity may be a strain on your heart, especially if you have heart disease. John’s wort. The primary endpoint was time to limiting angina in the evaluable cohort. In addition, patients were asked a global efficacy question and an optional partner questionnaire was administered.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 . * Seventy-two percent, 80%, and 85% of the patients on 25 mg, 50 mg, and mg of VIAGRA, respectively, achieved erections hard enough for sex, compared to 50% on placebo. There are lots of treatments that claim to be “herbal VIAGRA.” They can be found online or even at some drugstores. But there’s no such thing as “herbal VIAGRA.”. Dosage. The dose of Cialis you need will depend on whether you’re taking it daily or as needed. Daily doses are often between and 5 milligrams (mg). The as-needed dose is usually 10 mg but can range from 5–20 mg. The typicaldose of Viagra is 50 mg. However, the dosage can range from 25– mg.