[Effect of histamine and its antagonists on the muscle tone of the body of the non-pregnant and pregnant human uterus].

In the uterus body of nongravid and gravid women, proportionally to the dose used, histamine, promethazine, and cimetidine produce an increased muscular tonus, which is more pronounced in gravid uteri. The blocking agent of histamine H-1 receptors, promethazine, and the blocking agent of histamine H-2 receptors, cimetidine, separately or jointly applied in a dose of 10 micrograms/ml, significantly decrease the tonicizing effect of histamine. Histamine exerts its influence on the muscular tonus of the body of nongravid and gravid human uteri through histamine H-1 and histamine H-2 receptors.