· Sildenafil is used to treat erectile dysfunction and pulmonary arterial hypertension. Includes sildenafil side effects, interactions and indications.This medicine works best when you take it on an empty stomach an hour before sex. However, if you take sildenafil with a high-fat meal, it will take longer for the medication to start to work. 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 lungs, causing shortness of breath, dizziness, and tiredness. These small differences affect the way each medication works, such as how quickly it takes effect and wears off, and the possible side effects. It lasts 4 to 5 hours, or longer if you have mild to moderate ED.CHOOSE BRAND-NAME VIAGRA. The original little blue pill prescribed by doctors for over 20 years. Clinically proven to treat men with erectile dysfunction (ED) Ongoing . Take sildenafil as needed before sexual activity. The best time to take sildenafil is about 1 hour before sexual activity, but you can take the medication any time from 4 hours to 30 . Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or .Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient. The four main medicines taken by mouth for erectile dysfunction are: Avanafil Stendra. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow. Take sildenafil at around the same times every day. Generic versions of sildenafil, vardenafil and tadalafil are available. The information provided is for educational purposes only and is not intended to replace discussions with a healthcare provider.