Usual Pediatric Dose for Cold Symptoms Prescription formulations:1 month and older:Oral: 12.5 to 25 mg orally 3 to 4 times a day; alternatively, weight-based dosing of 5 mg/kg orally per day OR body surface area dosing of 150 mg/m2 orally per day may be used-Maximum dose: 300 mg/day...