求翻译：7．呼吸衰竭患者应慎用镇静剂，严格按医嘱执行，一般禁用吗啡及巴比妥类等抑制呼吸的药物，但在机械通气中需主动抑制呼吸时例外。是什么意思？

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7. breath failure patient should cautious use the sedative, according to the doctor's advice execution, generally is forbid strictly the morphine and the Barbitone kind and so on the suppression breath medicines, but needs the active inhibition breath when the machinery ventilation exception.