Effects of amino acid composition MP-33 in combination with trimetazidine were studied in metabolic therapy of elderly patients (age 63.3 +/- 1.7 years) with ischemic heart disease (angina pectoris functional class II-III). MP-33 (100 mg 3 times a day subling.), trimetazidine (20 mg 3 times a day per os), trimetazidine + amino acid composition MP-33 in the above doses in addition to basic therapy were given to 30, 15 and 15 patients, respectively. Combined therapy with trimetazidine and MP-33 significantly activated antioxidant enzymes and depressed lipid peroxidation due to GSH-dependent regulation of cellular redox status by MP-33.