Answer :
Final answer:
A decrease in facial muscle spasms indicates the effectiveness of benztropine in treating an acute dystonic reaction caused by fluphenazine.
Explanation:
When assessing the effectiveness of benztropine in treating an acute dystonic reaction caused by fluphenazine, a decrease in facial muscle spasms would indicate its effectiveness. Benztropine is commonly used to counteract the extrapyramidal side effects of antipsychotic medications like fluphenazine, which can lead to muscle contractions and spasms.
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