<prompt> Answer this question truthfullyWhat information is available on Isosorbide?  <response>: <reason> Before taking isosorbide:tell your doctor and pharmacist if you are allergic to isosorbide; nitroglycerin tablets, patches, or ointment; or any other drugs. tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially aspirin; beta blockers such as atenolol Tenormin, carteolol Cartrol, labetalol Trandate, Normodyne, metoprolol Lopressor, nadolol Corgard, propranolol Inderal, sotalol Betapace, and timolol Blocadren; calcium channel blockers such as amlodipine Norvasc, diltiazem Cardizem, felodipine Plendil, isradipine DynaCirc, nifedipine Procardia, and verapamil Calan, Isoptin; dihydroergotamine D.H.E. 45; sildenafil Viagra; tadalafil Cialis; vardenafil Levitra; and vitamins. tell your doctor if you have or have ever had low red blood cell counts anemia, glaucoma, or recent head trauma. tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking isosorbide, call your doctor. if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking isosorbide. you should know that this drug may make you drowsy or dizzy. Do not drive a car or operate machinery until you know how it affects you. tell your doctor if you consume large amounts of alcohol regularly and ask about the safe use of alcoholic beverages while you are taking isosorbide. Alcohol can make the side effects from isosorbide worse. 