At Strut , we offer prescription ED treatments like Sildenafil or Tadalafil online through a quick online questionnaire-based telemedicine consultation with our U. Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. The products discussed in this site may have different product labeling in different countries. Improving conditions that tend to have an effect on your performance in the bedroom such as high blood pressure, high cholesterol, or diabetes, may help you give your ED therapy an even bigger boost. If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes. The Half-Life of Sildenafil Explained 2. Stop taking VIAGRA and call your healthcare provider right away if you have any sudden vision loss sudden hearing decrease or hearing loss.The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 . CHOOSE BRAND-NAME VIAGRA. The original little blue pill prescribed by doctors for over 20 years. Clinically proven to treat men with erectile dysfunction (ED) Ongoing . Medically reviewed by Alex Brewer, PharmD, MBA Updated on October 12, Viagra (sildenafil) is a brand-name prescription drug that’s used to treat erectile dysfunction .