A peripheral vasodilator, blocks postsynaptic alpha1-adrenergic receptors and prevents the vasoconstrictive influence of catecholamines. It reduces pressure in the pulmonary veins and the right atrium significantly, it also reduces pulmonary vascular resistance moderately. The drug therapeutic indications include: arterial hypertension; CHF (in combination therapy), Raynaud's syndrome and disease, pheochromocytoma, peripheral vascular spasm on the background of poisoning with ergot alkaloids. Prostatic hyperplasia