Folia Pharmacologica Japonica
Online ISSN : 1347-8397
Print ISSN : 0015-5691
Pharmacological properties of dl-2-(3'-t-butylamino-2'-hydroxypropylthio)-4-(5'-carbamoyl-2'-thienyl)thiazole hydrochloride (S-596), a new β-adrenergic blocking agent
Youichi HARAEtsuro SATOAkira MIYAGISHIShunzi AONOHiroshi NAKATANI
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1979 Volume 75 Issue 7 Pages 707-720

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Abstract

We developed a new β-adrenergic blocking, antiarrhythmic compound S-596 and compared the findings with those of propranolol or practolol. S-596 antagonized the positive chronotropic and inotropic actions of adrenaline in isolated guinea-pig atria, and blocked the relaxant response to adrenaline of isolated guinea pig tracheal strips. In anesthetized mongrel dogs, S-596 given intravenously inhibited increases in heart rate and myocardial contractile force and decreases in systemic blood pressure induced by isoproterenol. In conscious dogs, the oral administration of S-596 reduced the isoproterenol induced tachycardia and the maximal effect was attained one hour after administration. In this regard S-596 was about 5 times more potent than propranolol, and S-596 was significantly longer-acting than propranolol. Thus, S-596 has greater β-blocking activity than propranolol.
S-596 has a lesser degree of myocardial depressant action than propranolol in spontaneously contracting rat or guinea pig atria and no intrinsic sympathomimetic activity in reserpinized rats. S-596 also has a weaker local anesthetic and antiarrhythmic activity than propranolol, as determined in guinea pigs and rabbits.

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