A child weighing 27 kg is prescribed Keflex (cephalexin) 150 mg orally once daily. The recommended dose range for children is 25 to 50 mg/kg/day, and the medication label states 125 mg per 5 mL. What is the safe dosage range in milligrams per day for this child, and does the ordered dose fall within this range?

The safe range is 337.5 mg to 675 mg per day, the ordered dose of 150 mg once daily is above the safe range and may cause toxicity.

The safe range is 337.5 mg to 675 mg per day, the ordered dose of 150 mg once daily is within the safe range and acceptable.

The safe range is 675 mg to 1350 mg per day; the ordered dose of 150 mg once daily is below the safe range and likely subtherapeutic.

The safe range is 675 mg to 1350 mg per day, the ordered dose of 150 mg once daily is within the safe range and appropriate for the child.