How Much Benadryl Can I Give My Four Year Old?

Question

He is 45lbs and has allergy that caused a rash.
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Answer 1

Hi! The recommended dosage of Benadryl for treating allergy or common cold symptoms in children (weighing 38-49 lbs) depends on the available preparations:
Liquid 12.5mg/5ml (tsp)= 1 1/2 tsp
Liquid 12.5 mg/5 milliliters (ml)= 7.5 ml
Chewable 12.5 mg= 1½ tablets
Tablets 25 mg= 1/2 tablets

Use syringes and droppers because they are more accurate than teaspoons. If possible, use the syringe or dropper that comes with the medication.  If not, medicine syringes are available at pharmacies. If you use a teaspoon, it should be a measuring spoon. Regular spoons are not reliable. Also, remember that 1 level teaspoon equals 5 ml and that ½ teaspoon equals 2.5 ml.

Benadryl can be repeated every 6 hours or as needed.