The safe dosage range for ranitidine (Zantac) for a child reads PO 4-5 mg/kg/day divided every 12h. The patient weighs 86 lbs and the order is for ranitidine (Zantac) 90 mg PO q12h. What is the lowest recommended dosage? What is the highest recommended dosage? Is it safe to administer the dosage ordered by the doctor? (Round to whole numbers)

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