The antipsychotic drug fluphenazine has a prolonged period of action when it is given by intramuscular injection, but not when it is given by intravenous injection.Suggest why this is the case.
精神抑制药氟
，采用肌肉注射的话会有一段延迟的反应期，但是采用静脉注射却没有，说明为什么会出现这种情况。
药)
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;The antipsychotic drug fluphenazine has a prolonged period of action when it is given by intramuscular injection, but not when it is given by intravenous injection.Suggest why this is the case.
精神抑制药氟，采用肌肉注射的话会有一段延迟的反应期，但是采用静脉注射却没有，说明为什么会出现这种情况。
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