Benadryl Dosage Calculator
Find recommended Benadryl dose by age and product type with max daily dose guidance.
Benadryl Dosing by Age and Product
Diphenhydramine (Benadryl) dosing depends on both patient age and product formulation. Adult tablets and liquigels contain 25 mg per dose unit, while children's products typically contain 12.5 mg per chewable or 12.5 mg per 5 mL of liquid. This calculator summarizes label-based guidance for common Benadryl products. For pet dosing, see the Benadryl Dosage for Dogs tool and the Cat Benadryl Dosage calculator.
Maximum Frequency
Most Benadryl products should not be given more than every 4 to 6 hours, with a maximum of 6 doses in 24 hours unless a clinician directs otherwise. Extra-strength and combination products have additional age restrictions that this calculator highlights.
When to Consult a Doctor
Do not give adult ULTRATAB or LIQUI-GELS to children under 6 years. Extra-strength products are not for children under 12. Children's liquid and chewables generally require physician guidance under age 6. Benadryl Allergy Plus Congestion should be discussed with a doctor for children under 12.
Frequently Asked Questions
How many doses of Benadryl can I give per day?
Standard labeling limits use to 6 doses in 24 hours, spaced every 4 to 6 hours as directed.
Can I give adult Benadryl to a 5-year-old?
Adult ULTRATAB and LIQUI-GELS are not recommended for children under 6. Use a children's formulation only after consulting a doctor.
What dose of children's liquid is typical for ages 6 to 11?
Label guidance is usually 5 to 10 mL (12.5 to 25 mg) every 4 to 6 hours, not exceeding 6 doses daily.
Is extra-strength Benadryl the same as two regular tablets?
Extra-strength ULTRATAB contains 50 mg diphenhydramine per tablet and is intended for adults and children 12 years and older only.
Does this calculator replace the drug label?
No. Always follow the package insert and your clinician's instructions. This tool provides educational summaries only.
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