Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. After being handed the bag, he left the store and was arrested by police following a short foot pursuit. Medicines that block an enzyme called CYP3A4. When criminals introduce prescription drugs into the U. Oral medicines for ED usually work well and cause few side effects. These medicines all work well for ED.A Florida man has been charged with several felonies and a misdemeanor after police say he threatened a CVS pharmacy, asking for “all bottles” of Viagra, Adderall and other drugs. The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Viagra (sildenafil) is a brand-name prescription drug that’s used to treat erectile dysfunction (ED). Learn about side effects, warnings, dosage, and more.