It comes in the form of a tablet or liquid. Both are taken by mouth. It also comes in an intravenous form, which can be ordered online without doctor. You may start on a lowered dosage of Sildenafil oral tablet which is available under brand name Viagra.

Call your doctor right away if you have serious side effects. Call for medical help if your symptoms feel life threatening or if you think you’re having a medical emergency.

To help avoid interactions, your doctor should manage all of your OTC medications carefully. To find out how this drug might interact with something else you’re taking, talk with your doctor or pharmacist.