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.
精神抑制药氟奋乃定，采用肌肉注
会有一段延迟反应期，但是采用静脉注却没有，说明为
么会出现这种情况。
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.
精神抑制药氟奋乃定，采用肌肉注会有一段延迟反应期，但是采用静脉注却没有，说明为么会出现这种情况。
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