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Hello there. My name isXXXXX and I am sorry to hear that scrappy is trying to get himself into trouble. Even though that is a high dose of benadryl it will not cause any problems with scrappy. It may make him pretty tired but other than that it will not cause much of a problem. Benadryl is a very safe medication and even at high doses will not be toxic. So i would just monitor him, let him sleep it off. I would not try to induce vomiting again because the risk of inducing vomiting outweighs the effects of benadryl. I hope that makes sense and I hope that helps. Please let me know if you have any additional questions or concerns. I would be happy to help. Please do not forget to rate my response so I receive credit for my time. Thank you!