What is the definition or description of: benadryl (diphenhydramine) overdose?

See below: Benadryl, also known as diphenhydramine, is a type of medicine in the class of antihistamines. It is found in many over-the-counter cold and sleep medicines. An overdose is when someone consumes more than the recommended amount of a drug or medication. Benadryl overdose can be deadly as it can lead to an abnormal heart rhythm. Patients are often dehydrated, feverish, and confused.

BENADRYL (diphenhydramine) OVERDOSE: The maximum amount of Diphenhydramine that you should take in any 24-hour period is 300 mg. Symptoms of a Benadryl (diphenhydramine) overdose include extreme sleepiness, confusion, weakness, ringing in the ears, blurred vision, large pupils, dry mouth, flushing, fever, shaking, insomnia, hallucinations, and possibly seizures. Seek emergency medical attention if an overdose is suspected.