Common side effects include headache, facial flushing, indigestion, and dizziness. While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. An inherited eye disease that affects the retina. A phone or video consultation is sometimes required for legal purposes.Generic versions of sildenafil, vardenafil and tadalafil are available. When oral medications might not be safe Check with your health care team before you take any medicine for . Best subscription service for Viagra and generic Viagra: Rex MD Viagra Although erectile dysfunction (ED) may be an upsetting diagnosis for some, many people find their . Transfer your prescription for Sildenafil (Generic for Viagra, Oral Tablet) on Amazon Pharmacy. FREE SHIPPING for Prime members.