Viagra is also informally known as “vitamin V”, “the blue pill”, or “blue diamond”, as well as various other nicknames. As part of the sale, it is recommended that you document this with your GP and have a health-check within 6 months if the regular need for the medication is required. What special dietary instructions should I follow? The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St. Essentially, Viagra and Viagra Connect are almost exactly the same.According to price-comparison site , generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s . 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 . 1. How it works. Sildenafil may be used to treat erectile dysfunction (ED or impotence) in men (Viagra brand) or pulmonary arterial hypertension in both men and .