The invention refers to the pharmaceutical means for the treatment of cardiovascular diseases and can be used as a substance restoring myocardium function in the course of treatment for different forms of this pathology.There is proposed a new tetrapeptide alanyl-glutamyl-aspartyl-arginine with general formula: Ala-Glu-Asp-Arg sequence 1 [SEQ ID NO:1], revealing biological activity, which is manifested in the restoration of the myocardium function.There is proposed a pharmacological substance containing an effective amount of tetrapeptide alanyl-glutamyl-aspartyl-arginine with general formula: Ala-Glu-Asp-Arg sequence 1 [SEQ ID NO:1] as an active peptide agent, revealing biological activity, which is manifested by the restoration of myocardium function. Being included in the medication, this substance contributes to the restoration of the myocardium function.