Storage Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Dosage and strength for pulmonary hypertension Sildenafil tablets for pulmonary hypertension come in 10mg and 20mg strengths. Children 1 year of age and older weighing 20 kg or less—10 mg 3 times a day. Stop taking VIAGRA and call your healthcare provider right away if you have any sudden vision loss sudden hearing decrease or hearing loss. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and site usage information with other information we have about you. From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health.Brand names for sildenafil include Viagra, Revatio, and Per unit Price; milliliters: $ $ See brand name versions of this drug: The easiest way to lookup drug information, identify pills, check interactions and set up your own personal medication records. Available for Android and iOS devices. Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum recommended dose is . The average cost per pill of Viagra, for example, is $ But sildenafil, the generic version of Viagra, costs as low as $9 per pill. Many services sell these therapies, so a bit of .