Those with pre-existing conditions should always consult a healthcare provider before taking new medications or supplements. 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. While this may seem like the most comfortable option upfront, we always encourage you to prioritize your safety and wellbeing over convenience. The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. An erection results from an increase in blood flow to the penis.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 . According to price-comparison site test1.ru, generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s . 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 .