Can I mix childrens benadryl with milk?

If your child has allergy symptoms of a stuffy or runny nose you should avoid milk products as it makes the mucous (or snot) thicker and more difficult for the child to expel or blow out of his/her nose. You are better off to mix with juice or water.

it depends on the age of the child my friend who works as a pharmacist says it can be mixed with juice

Perhaps mixing children benadryl with milk would make the milk sour, maybe try it with a little amount of milk or do speak to a pharmacist who would give you more accurate info.

Take care!