AdExplore a preventive migraine treatment with 4x a year dosing. Visit the official patient site to view migraine treatment information.Pregnant Women: There are increased risks for stroke, heart failure, preterm delivery, and maternal and fetal death for pregnant women with untreated pulmonary arterial hypertension. The medicine will come with a plastic syringe or spoon to help you take the right amount. Do not drink grapefruit juice if you’re taking sildenafil Revatio for pulmonary hypertension. If you take too much Taking too much sildenafil can cause unpleasant side effects. In pulmonary hypertension it works by relaxing blood vessels in the chest. There are no adequate and well-controlled studies of sildenafil in pregnant women. However, the addition of sildenafil to bosentan therapy did not result in any improvement in exercise capacity. · 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. Generic Viagra (sildenafil) is available as a , , , and milligram (mg) pill and in liquid form. It’s meant to be taken as needed — about an hour before sex — but shouldn’t be. Tadalafil (Cialis) $ $ 44% Sildenafil $ $ 24% Mental Health Escitalopram $ $ 59% Bupropion XL $ $ 48% Fluoxetine .Most patients receive a prescription for 50 mg of oral sildenafil, taken as needed approximately 1 hour before sexual activity. Its use is not studied in patients with severe hepatic impairment. In patients with vasoactive pulmonary arterial hypertension, vasodilation of the pulmonary artery leads to reduced resistance to blood flow, with subsequent reductions in mean pulmonary arterial pressure. How and when to take sildenafil It’s important to take sildenafil as advised by a doctor or pharmacist. Epistaxis was not observed in patients with idiopathic PAH.