Pharmacological influence of Calan is explained by braking of a flow of calcium ions through the slowed-down calcic tubules of cellular covers of smooth muscle structure of vessels and a cardiac muscle. Calan is prescribed if it was diagnosed paroxysmal supraventricular tachycardia (except WPW syndrome), sinus tachycardia, premature atrial contraction, blinking and atrial flutter, stenocardia (inc. stress, postinfarction), arterial hypertension, hypertensive crisis, idiopathic hypertrophic subaortic stenosis, hypertrophic cardiomyopathy.