When you make the appointment, be sure to ask if there’s anything you need to do in advance. The body takes longer to absorb it after a high-fat meal or alcohol. This medicine also works best when you take it an hour before sex on an empty stomach. These medicines all work well for ED. This medication is taken with or without food an hour before sex. Take sildenafil exactly as directed. An inherited eye disease that affects the retina.Oral medications are a successful erectile dysfunction treatment for many men. They include: Sildenafil (Viagra) Tadalafil (Adcirca, Cialis) Vardenafil (Levitra, Staxyn) Avanafil . Never order medicines from an online pharmacy that doesn’t list its phone number and physical address, has prices that seem too good to be true, or tells you that no . Viagra (sildenafil) is a prescription drug that’s used to treat erectile dysfunction (ED). The drug comes as a tablet you’ll take by swallowing. It’s usually taken as needed about 1 .