Assertion: caffeine | /r/CapableOf | constrict blood vessels
Facets:
value: to help relieve headache
type: PURPOSE
value: to help relieve allergy symptoms
type: PURPOSE
Source sentences:
text: It constricts blood vessels to help relieve allergy symptoms and headache, hence its inclusion in many over-the-counter medications.
text: Caffeine is a vasoconstrictor, which means that it constricts blood vessels.