You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. What other meds might still be on the app? Children younger than 1 year of age—Use and dose must be determined by your doctor. There are many safe, reliable online services offering ED prescriptions. 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. That was just the coupon, no insurance!Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial hypertension, a serious heart and lung condition. This drug is more popular than comparable drugs. It is available in generic and brand versions. Sildenafil (Revatio) is used to treat pulmonary arterial hypertension (PAH) in children and adults. It improves your ability to exercise and can help prevent PAH from getting worse. Reviewed by: Aileen Chu, PharmD, BCPS. Christina Aungst, PharmD. 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.