Tramadol is a pain reliever, similar to but not a narcotic that is used for moderate to severe pain. Tramadol should only be given to a pet when prescribed by a vet. If your pet is on any other medications, it's important to tell your vet as there could be drug interactions. If your pet is taking tramadol and exhibits any of the following side effects - weakness, vomitingd, constipation, appetite loss, insomnia, seizure, blisters or peeling of skin, rash, difficulty breathing, contact your vet immediately.