The four main medicines taken by mouth for erectile dysfunction are: Avanafil Stendra. Once a doctor has reviewed your results, your order should take business days to arrive. Insurance: If you plan to use insurance, make sure the online provider accepts it. Erectile dysfunction can be caused by a variety of factors , including age, cardiovascular problems, diabetes, and other conditions that affect nerve function or blood flow. However, all medications come with risks.You can take the drug 30 minutes to 4 hours before you anticipate sexual activity. Based on how well you respond to this dosage and any side effects you have, your . Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles . To get the free trial, you just need to use this promo code. Free Samples of Viagra. ViaBestBuys offers free samples of mg viagra. The downside of this one is you do have to pay for shipping, but they accept bitcoin and PayPal, so they can’t take .