If approved, the provider will issue a prescription. There are many safe, reliable online services offering ED prescriptions. This allows the smooth muscles in the penis to relax and fill with blood. Those with pre-existing conditions should always consult a healthcare provider before taking new medications or supplements. Methodology We researched 19 online platforms for erectile dysfunction treatment to learn more about the process of ordering ED pills online.Pros and cons at a glance The following are some of the advantages and disadvantages of Viagra. Pros effective treatment for erectile dysfunction readily available by prescription . Muse, Caverject, and Trimix can be good substitutes for Viagra (sildenafil). But they require insertion or injection into the penis. There’s some evidence that L-arginine might help . Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult males* with .