on the other hand , some h1-receptor antagonists ( mequitazine , cyproheptazine , clemastine , diphenylpyraline , promethazine , homochlorcyclizine and alimemazine ) had high affinity for the muscarinic receptors ( ki = 5.0-38 nm ) .
C2757048
h1-receptor antagonists
C0008929
clemastine