Sildenafil is also sometimes used to treat pulmonary hypertension high blood pressure in the blood vessels that supply the lungs. Insurance: If you plan to use insurance, make sure the online provider accepts it. Levitra vardenafil : This medication is taken one hour before sex and can last up to 24 hours. You’ll also need to fill out a medical questionnaire with answers about your medical history, current medications, and lifestyle habits. While you are improving your chances of achieving an erection with the higher dose, the risk of side effects is higher too.Sildenafil oral tablet is a prescription medication used to treat erectile dysfunction (ED) and pulmonary arterial hypertension (PAH). Sildenafil can be taken . Cost: Consultation prices vary based on the prescriber; $5 generic prescriptions Medical Consultation Required: Yes Medications Prescribed: Viagra, Cialis, . Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes .