Deracoxib is a member of the class of drugs known as NSAIDs (non-steroidal anti-inflammatory drugs), the same class as such common over-the-counter remedies as Advil (Ibuprofen), Aleve (Naproxen), Orudis (ketoprofen), and Aspirin. The chief use for such drugs in the dog has been pain relief, usually joint pain or post-surgical pain relief.
The problem with this class of drugs has been unacceptable (even life-threatening) side effects. Problems have in the past been related to:
Stomach ulceration - even perforation and rupture of the stomach can occur. This is not only painful but life-threatening.
Platelet deactivation - platelets are the cells controlling the ability to clot blood and, as a general rule, it is preferable not to promote bleeding. We would prefer platelets to remain active and able to function should we need them.
Decreased blood supply to the kidney - this could tip a borderline patient in to kidney failure.
Tramadolis a narcotic analgesic
Cosequin is a glucosamine product in poder/tablet form and can take 4-6 weeks to see results. You may also have to increase/descrease the number of tablets/powder you give depending on the length of time a dog is taking the product.
Hope this information is helpful

Just be careful and keep a close watch because of the first 2 drugs.