Abstract. This article examines the mechanisms by which alkaloids influence the cardiovascular system and evaluates their major pharmacological effects. Alkaloids are naturally occurring nitrogen-containing compounds with diverse biological activities and significant pharmacological potential. The study focuses on their effects on cardiac rhythm, myocardial contractility, cardiac conduction, vascular tone, and arterial blood pressure. Particular attention is given to the interaction of alkaloids with ion channels, adrenergic and cholinergic receptors, the autonomic nervous system, and intracellular signaling pathways. The analysis indicates that different alkaloids may produce vasodilatory or vasoconstrictive effects and may modify heart rate and myocardial contractility depending on their chemical structure, concentration, and mechanism of action. The potential therapeutic significance of alkaloids in cardiovascular pharmacology is also considered, together with their possible toxic effects and dose-dependent adverse reactions. The findings suggest that alkaloids represent an important source of biologically active compounds with potential applications in cardiovascular drug development. Further experimental and clinical studies are required to establish their therapeutic efficacy, optimal dosage, pharmacokinetic characteristics, and long-term safety.