We also looked at additional services, such as access to digital pharmacies and home delivery options. Other uses for this medicine This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information. Oral medicines for ED usually work well and cause few side effects. This is a type of high blood pressure that occurs between the heart and the lungs. It lasts 4 to 5 hours, or longer if you have mild to moderate ED. John’s wort. Cialis tadalafil : This ED medication works with the same principle as Viagra, but lasts up to 36 hours.Viagra is a brand-name medication that contains the active drug sildenafil. This active drug comes as a generic medication, too. Sildenafil and brand-name Viagra are both used to treat ED. Dizziness, headache, flushing, or stomach upset may occur. Vision changes such as increased sensitivity to light, blurred vision, or trouble telling blue and green colors apart may also occur. If. According to price-comparison site test1.ru, generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s compared with more than $50 per.