Use the oral syringe provided with your medication to measure and take your dose. How and when to take sildenafil It’s important to take sildenafil as advised by a doctor or pharmacist. You can take this medicine with or without food 30 minutes before sex, depending on the dose. Oral medicine for ED also might not be safe or work well if you have: Very low blood pressure, called hypotension, or uncontrolled high blood pressure, called hypertension. Do not use a kitchen teaspoon as it will not measure the right amount. 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. Often, these are prescribed for chest pain called angina. · Maximum dose: 20 mg orally three times a day. Injection: Initial dose: or 10 mg IV bolus three times a day. Comments: No greater efficacy was achieved with oral doses higher than the maximum recommended dose. A 10 mg injection dose is predicted to provide pharmacological effect equivalent to the 20 mg oral dose. $ (save %) local_offer_outlined Avg retail price $ medication_outlined Availability Available See GoodRx coupons warning Are you looking for information on sildenafil (Revatio) instead? What is Sildenafil (Viagra)? Drug Facts Common Brands Viagra Drug Class PDE-5 inhibitor. Does the price of sildenafil vary based on strength or what it’s prescribed for? Sildenafil citrate- sildenafil tablet, film coated. (). https.