An antagonist drug acts by:
A. Preventing the release of a neurotransmitter.
B. Binding to a receptor to facilitate the effect of a neurotransmitter.
C. Elevating neurotransmitter levels in the synaptic cleft.
D. Increasing the number of active receptors on a cell membrane.
ANS: A
Rationale: Antagonist drugs act by preventing neurotransmitter release or by binding to a receptor and impeding the effects of a naturally occurring transmitter.
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