The study aimed to evaluate the basic pharmacological effects of modified phenyl carbamic acid derivates with a basic part made of N-phenylpiperazine (compounds 6a, 6b, 6c, 6d) in Wistar rats. The compounds were evaluated for their ability to decrease the phenylephrine-induced contraction of the aortic strips of rats after repeated administration of the compounds and their ability to inhibit the positive chronotropic effect of isoproterenol on spontaneously beating rat atria. The ability to inhibit the vasoconstriction effect of phenylephrine was confirmed in all compounds in the range from 10.39 % to 13.65 %. The most significant vasoconstriction was achieved in compound 6d (86.35%, p < 0.001). None of the compounds reached the effect of carvedilol. All compounds proved an antagonistic ability to the positive chronotropic effect of isoproterenol. The highest value of the anti-isoproterenol effect was identified for the compound 6c (pA2 = 8.21 ± 0.56; p < 0.05). Only compound 6a decreased heart rate significantly (by 3.17%, p < 0.05), so we can indicate its potential negative chronotropic effect. The obtained results showed that the evaluated compounds confirmed the basic characteristics of beta-blockers with additional α-adrenolytic properties.
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