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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
I'm sorry for the long wait. It sounds like he may be having a bit of an adverse reaction to the Hydrocodone. We can see some dogs get agitated from opiates. They can show signs of trembling and vocalizing.
I would just give the Hydrocodone as needed for coughing at this point. You can finish the antibiotics, but the cough suppressants are typically only needed the first 3-5 days.
I hope this helps, let me know if you have any other questions.