Recommended dose: 20.0 mg per dose, max 120 mg per day.
At 20.0 kg, the weight-based dose is 20.0 mg (1 mg/kg), taken every 4-6 hours.
Do not exceed 120 mg in 24 hours (20.0 mg x the maximum 6 doses), and never more than the 150 mg/day label ceiling. Stop use and consult a doctor if symptoms persist beyond 7 days.
Diphenhydramine causes drowsiness - avoid driving, machinery operation, or alcohol while taking it.
Next stepThis calculator provides general guidance only. Always read the product label and consult a healthcare professional for medical advice.