Organic nitrates (eg, nitroglycerin, isosorbide dinitrate, and isosorbide mononitrate) are widely used as vasodilators for the treatment of ischemic heart disease and heart failure. Organic nitrates such as nitroglycerin also are used in explosives. Bismuth subnitrate, ammonium nitrate, and silver nitrate are used in antidiarrheal drugs, cold packs, and topical burn medications, respectively. Sodium and potassium nitrate and nitrite are used in preserving cured foods and may also occur in high concentrations in some well water and in antifreeze mixtures. Butyl, amyl, ethyl, and isobutyl nitrites often are sold as "room deodorizers" or "liquid incense" and sometimes are inhaled for abuse purposes.