Never purchase ED medications from a site or service that doesn’t require a prescription and medical documentation. That’s not to say there aren’t just as many illegitimate sites. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction. If you prefer, you may contact the U. However, all medications come with risks. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide.Cart. Transfer your prescription for Sildenafil (Generic for Viagra, Oral Tablet) on Amazon Pharmacy. FREE SHIPPING for Prime g: internet. Still, if your doctor says it’s okay for you to use and you end up paying out-of-pocket, you can still get the generic for a lot less than Viagra. According to price Missing: internet. 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 .