Assertion: promethazine | /r/CapableOf | block histamine
Facets:
value: competitively
type: MANNER
value: from binding to many
type: TRANSITIVE-OBJECT
Source sentences:
text: As an antihistamine, promethazine competes with histamine for binding at some of its receptor sites (H1-receptors), thereby blocking histamine from binding to many.
text: Promethazine is a phenothiazine derivative that competitively blocks histamine [H(1)] receptors and exhibits antiemetic and sedative properties.