results also indicate that the excitatory uterine inotropism elicited by the agonistic amine in me strips isolated from rats at the 16th day of pregnancy , was coincident with an enhanced release of prostaglandins ( pgs ) e2 and f2 alpha , but not of pge1 and that both augmenting actions of histamine were antagonized by histamine h1 receptor-blockers , namely pyrilamine ( mepyramine or chlorpheniramine .
C0032961
pregnancy
C0002335
pge1