Refill and transfer prescriptions online or find a CVS Pharmacy near you. Shop online, see ExtraCare deals, find MinuteClinic locations and more.A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow. Common ones include: Flushing of the skin. These medicines all work well for ED. Follow the manufacturer’s directions to use and clean the oral syringe. Also tell your doctor if you or any of your family members have or have ever had an eye disease such as retinitis pigmentosa an inherited eye condition that causes loss of vision or if you have ever had sudden severe vision loss, especially if you were told that the vision loss was caused by a blockage of blood flow to the nerves that help you see. Take sildenafil at around the same times every day. This can happen if you are sick with fever, diarrhea, or vomiting; sweat a lot; or do not drink enough liquids.Sildenafil (Viagra) may interact with certain medications or supplements. Always let your doctor and pharmacist know about any other medications or supplements (including prescribed and over-the-counter medications, vitamins, and dietary or herbal supplements) that you are currently taking. Examples of Viagra’s more commonly reported side effects include: headache. flushing (temporary warmth, redness, or deepening of skin color) stuffy nose. indigestion (upset stomach) mild vision. Learn how your medication interacts with other prescriptions, over-the-counter (OTC) drugs and/or supplements. Check Drug Interactions. Email Newsletter Signup. Sign up for our .If you become pregnant while taking sildenafil, call your doctor. Do not take more or less of it or take it more often than prescribed by your doctor. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. This medicine works best when you take it on an empty stomach an hour before sex. Sildenafil Viagra is used to treat erectile dysfunction impotence; inability to get or keep an erection in men. Some medications should not be taken with sildenafil.