The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. And not all online pharmacies have the capability to safely ship medications that need to be temperature-controlled, such as insulin. This allows the smooth muscles in the penis to relax and fill with blood. Common side effects include headache, facial flushing, indigestion, and dizziness. Box , Mission, KS If your pharmacy does not participate, you may be able to submit a request for a rebate in connection with this Savings Offer.Depending on your symptoms and needs, you may be prescribed Viagra, sildenafil, Cialis, tadalafil, Stendra, paroxetine, or a combination of tadalafil and sildenafil, available as . generic Revatio and Viagra Used for Pulmonary Hypertension and Erectile Dysfunction MORE expand_more Check your prescription Prescription 20mg sildenafil (30 tablets) . Brand names: Viagra, Revatio, Liqrev. Drug classes: agents for pulmonary hypertension, impotence agents. Sildenafil systemic is used in the treatment of: Erectile Dysfunction. .