Ismo is in a group of drugs called nitrates. Ismo dilates (widens) blood vessels, making it easier for blood to flow through them and easier for the heart to pump. Ismo is used to prevent angina attacks (chest pain). Ismo will not treat an angina attack that has already begun. Ismo may also be used for purposes not listed in this medication guide.

Communicate to your doctor or pharmacist before taking Ismo 20 Tablet 30's if a patient has low performing thyroid gland, iundernourished because of a poor diet, has severe liver/kidney problems, suffers from hypothermia (very low body temperature), suffers from very poor blood circulation, has had any lethal damage to heart such as a heart attack or suffers from a disease called glaucoma (increased pressure in the eye).