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My name is ***** ***** I have been a Vet tech for 30+ years. If he is swollen after ingesting the cough medication, he should see a Vet asap. That means it is an allergic reaction to the medication and needs a shot of Benedryl and possibly a steroid to help with the reaction. Please take the bottle with you into the Vet so he has a reference to the medication and can treat accordingly. Please watch for the tongue swelling as that can cut off the airway.
How is your Dog doing tonight since the allergic reaction? I hope he is better. Please let me know.