Applies to the following strengths: 50 mg/mL; 12.5 mg; 25 mg; 12.5 mg/5 mL; 50 mg; 10 mg/mL; 19 mg; 6.25 mg/5 mL; 25 mg/5 mL; 50 mg/30 mL; 6.25 mg/mL. Do not give diphenhydramine to a child younger than 2 years old