How Much Benadryl is too Much?

Benadryl is an antihistamine, which is used in the treatment of colds, allergies, sneezing, runny nose and hives. For adults, if you exceed the recommended dosage of 25 to 50 milligrams, for more than four times each day, then this is too much. For children, the dosage should not be more than 12.5 milligrams to 25 milligrams and no more than 300 milligrams is recommended over a 24-hour period.