The barouterography method revealed that intravenous phenibut in a dose of 50 mg/ kg and phenazepam in a dose of 2.5 mg/kg have a suppressive effect on the contractile isometric (fetus-expelling) activity of the uterus in nonpregnant and pregnant rabbits. Phenibut (150 mg/kg) and phenazepam (3 mg/kg) do not have an adverse effect on fetal development in rats. Clinical trials of phenibut and phenazepam as gravidoprotectors in threatened abortions are recommended.
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