What organ is Benadryl bad for?

I'm curious, could you elaborate on the potential harm that Benadryl may pose to a specific organ? Is there a particular area of the body that is particularly vulnerable to the effects of this medication? I'm interested in understanding the risks associated with its use and how it might impact overall health, especially with regards to a specific organ system. Please provide a concise yet informative explanation, keeping in mind the importance of accuracy and precision in medical discussions.