The four main medicines taken by mouth for erectile dysfunction are: Avanafil Stendra. The safety of sildenafil is not established in patients with active peptic ulceration or bleeding disorders. Sildenafil comes as a tablet and suspension liquid to take by mouth. These include a heart attack, stroke or a serious heart rhythm disorder in the past six months. These medicines all work well for ED. Do not start these medications while taking sildenafil without discussing it with your healthcare provider. Tell your doctor or pharmacist if you are taking nitrates medications for chest pain such as isosorbide dinitrate Isordil , isosorbide mononitrate Monoket , and nitroglycerin Nitromist, Nitro-Dur, Nitrostat.VIAGRA can cause your blood pressure to drop suddenly to an unsafe level if taken with certain other medicines. Do not take VIAGRA if you take any other medicines called “nitrates.” Nitrates are used to treat chest pain (angina). A sudden drop in blood pressure can cause you to feel dizzy, faint, or have a heart attack or stroke. Sildenafil Prices, Coupons & Savings Tips – MDRx Sildenafil Citrate Coupons, Prices, and Savings Card Brand Names: Revatio, Viagra Sildenafil is used to treat male sexual . Sildenafil is a generic drug, which is an exact copy of the active drug in a brand-name medication. The generic is considered to be as safe and effective as the original drug. And generics tend to.