Click here for an email preview. In addition to your prepared questions, don’t hesitate to ask additional questions during your appointment. Do not press on the plunger of the syringe. Do you use any illegal drugs? Consult First a Primary Care Doctor It is always best to consult a primary care doctor before a specialist. Do not keep outdated medicine or medicine no longer needed.Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or alcohol. Its effects . Erectile dysfunction (ED) is the medical term for trouble getting or maintaining an erection that is satisfying for sexual activities. Doctors for ED include urologists, endocrinologists. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take sildenafil exactly as directed. .