as 5-hydroxytryptamine can interrupt pregnancy in all its stages in mice and as pregnancy can be protected from the action of 5-hydroxytryptamine by either progesterone or by prolactin only in early ( days 1 to 6 ) but not in late pregnancy ( day 14 ) , the present experiments with two antagonists of 5-hydroxytryptamine , namely methysergide and cyproheptadine , were carried out .
C0032961
pregnancy
C0025842
methysergide