This is important for your overall health and safety, as certain medications can negatively interact with each other or cause existing conditions to worsen. EPO plans, deductibles, etc. When did your erectile dysfunction start? They have the same benefits and risks as their brand-name counterparts. If you feel nervous about how to talk to your doctor about ED, try using this checklist to help you find the right words.Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum recommended dose is . 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 . In addition to Viagra, other ED drugs available in the United States include avanafil (Stendra), tadalafil (Cialis) and vardenafil (Levitra). These all improve blood supply to the .