- n. pharmacology A blocking agent, one of a class of drugs used to treat hypertension and control the rate at which the heart beats.
- n. any of various drugs used in treating hypertension or arrhythmia; decreases force and rate of heart contractions by blocking beta-adrenergic receptors of the autonomic nervous system
- From action of drug which blocks beta-adrenergic receptors. (Wiktionary)
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