Some alternative products that claim to work for erectile dysfunction can be dangerous. 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. In addition to your prepared questions, don’t hesitate to ask additional questions during your appointment. Box , Mission, KS If your pharmacy does not participate, you may be able to submit a request for a rebate in connection with this Savings Offer. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient. Take your partner along, if possible.Always speak with your healthcare provider about possible interactions with all prescription drugs, vitamins, herbs and supplements, and over-the-counter drugs . Print Products and services Erectile dysfunction: Viagra and other oral medications By Mayo Clinic Staff Medicines that you take by mouth are called oral . Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements. VIAGRA may affect the .