12 patients with coronary heart disease were studied to see whether high doses of isosorbide dinitrate ( isdn , corovliss ) or isosorbide 5-mononitrate ( is-5-mn , ismo ) increase the erythrocyte methemoglobin production in an acute experiment and after 4 days of medication .
C0022252
isosorbide dinitrate
C0064079
isosorbide 5-mononitrate