· Sildenafil is used to treat erectile dysfunction and pulmonary arterial hypertension. Includes sildenafil side effects, interactions and indications.Tell your doctor if sildenafil is not working well or if you are experiencing side effects. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Tell your doctor or pharmacist if you are taking nitrates medications for chest pain such as isosorbide dinitrate Isordil , isosorbide mononitrate Monoket , and nitroglycerin Nitromist, Nitro-Dur, Nitrostat. You take one 2.Sildenafil oral tablet is a prescription medication used to treat erectile dysfunction (ED) and pulmonary arterial hypertension (PAH). If you have sudden hearing loss with or without tinnitus.  · 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. The dose can be increased to mg or decreased to 25mg depending on its effect. Take sildenafil up to 4 hours before you want to have sex. For sildenafil to work properly, you’ll need to be sexually excited. Dosage and strength for pulmonary hypertension. Sildenafil tablets for pulmonary hypertension come in 10mg and 20mg strengths.ED medications can cause side effects, and it’s crucial to have access to a medical provider if needed. Small case studies in pregnant women with PAH indicate a low risk of harm, though caution is warranted. There may be attacks of vestibular ataxia, which are often combined with the illusion of a change in the surrounding space. During the review of systems, assessment for visual changes is recommended. This allows the smooth muscles in the penis to relax and fill with blood.