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Good evening, I am sorry to hear that your dog is not feeling well. Sometimes dogs that are given non-steroidal anti-inflammatory medications can become lethargic or ataxic (walking like they are drunk) however these are very rare occurrences. More often than not there is no lethargy noted when this drug is administered. The difficult thing about Isabella's condition is that pancreatitis can cause the very things you are describing. We commonly see vomiting, nausea, loss of appetite and lethargy. Because either of these can be the cause of her signs, my best recommendation is to wait and see if it resolves with time. If so, then it was likely the medication and you can reduce her dose next time. If it does not resolve with time then she may be experiencing this from her pancreatitis and in this case, she will feel poorly until the inflammation in her pancreas resolves but should gradually start feeling better over the next 3-5 days or so.
There is no direct antidote to the meloxicam and with her signs being so mild, I would not recommend reversing it anyway as pancreatitis can be very painful and the meloxicam is potentially helping her to hurt less. You can feed her a bland diet to help ease her GI discomfort as long as she is not vomiting. If she is vomiting or hasn't eaten in 48 hours or more then she sold be re-evaluted as sometimes hospitalization is recommended for dogs with pancreatitis.
Does this help to address your concerns tonight?