Why is the maximum dose of acetaminophen

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Why is the maximum dose of acetaminophen given?2-choose any medication and re-write the order in plain English.
3-you are taking the patient’s vital signs and note the following: HR 76, Resp 18, Temp 98.6 F, BO 98/60. Would you administer the patients’ metoprolol succinate? why? why is this order in place?