Calculate the Safe Dosage Ranges (SDR) and Drug Dose and Indicate

Short Answer

Calculate the safe dosage ranges (SDR) and drug dose and indicate if it is safe to administer or if it should be held. (Hold = Recheck order, recalculate dose, and contact prescriber promptly if it is an underdose or overdose.) Use a calculator to solve these problems.
-Order: 50 mg po daily.
Child's weight: 22 lb.
SDR for this child's weight: 10-20 mg per kg per day.
Safe or hold?