The same increase in nitric oxide that helps penile muscles relax also opens up blood vessels, leading to a drop in blood pressure. Pain in joints Elevated blood pressure Using this drug may cause serious reactions. They’re often the first line of treatment for trouble getting or keeping an erection, called erectile dysfunction ED. You deserve to put ED behind you and to enjoy your sex life. It may be difficult to remain firm despite wanting to have sex. People taking nitrates like nitroglycerin Nitrostat or isosorbide mononitrate Imdur should not take PDE5 inhibitors, as doing so could result in a dangerous drop in blood pressure. Answer: In short, the drug in Viagra, Sildenafil, dilates blood vessels at the entrance to the penis.Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online. 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 compared with more than $50 per. Lemonaid can prescribe sildenafil (generic Viagra), tadalafil (generic Cialis), and vardenafil (generic Levitra). You can get a prescription online following a quick and easy visit with a member of our clinical team. Then the Lemonaid pharmacy, licensed in all 50 states, will ship your meds directly to your door in discreet packaging.