Assertion: beta blocker | /r/HasProperty | developed in 1960
Facets:
value: for the treatment of angina pectoris
type: PURPOSE
Source sentences:
text: β adrenergic receptor antagonists (also called beta-blockers or β-blockers) were initially developed in the 1960s, for the treatment of angina pectoris but are now also used for hypertension, congestive heart failure and certain arrhythmias.