Both options require valid medical documentation, but some online services only require a health questionnaire to be filled out and reviewed for approval—meaning no face-to-face video interaction is needed. Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours. In some cases, ED can cause a strain on relationships and impact self-esteem. Yes, ED pills can cause side effects. Those who don’t feel comfortable discussing ED with an in-person provider or lack time to visit a doctor’s office may find online ED prescriptions beneficial.Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes . Viagra (, 50, 25 and 20mg) takes about 30min to have full effect but cannot be taken with food, as it can diminish the result. The 20mg dose can also be compounded at . An FDA investigation found that more than one-third of “dietary supplements” sold for ED actually contained prescription drugs, including sildenafil, the medicine in Viagra. Some .