Hello. My name is ***** *****
Thank you for your question.
I will be happy to provide you the information you are seeking for educational purposes only.
I am very sorry to hear about this tragic situation and as a cat parent myself, I can only imagine what you are going through.
Unfortunately, generally, dispensing the wrong medication would be considered negligence and also can be basis for malpractice claim, however, the only legal recourse would be to file a complaint against the pharmacy and pharmacist who made the mistake, as it would be legally impossible to seek any financial compensation, beyond the replacement cost of the deceased cat.
I am very sorry to provide you with this bad news, but please nderstand that I do have professional obligation to provide JustAnswer.com customers with correct answers, even when answer is not favorable to the customer.
I wish you the best of luck and God bless you!