Order: Phenobarbital 80 mg po q12h is ordered for a child weighing35.2 lb. The recommended dosage is 6 to 8 mg/kg/day.  Available: Phenobarbital oral suspension 20 mg per 5 mL What is the safe 24 hr dosage range for this pt? Round to the nearest tenth? Is the dosage ordered safe? Health Science Science Nursing NURSING 2104 Share QuestionEmailCopy link Comments (0)