In case you're searching, Dasuquin, Adequan and Buprenex or Buprenorphine are the correct spellings.
Dasuquin is an advanced form of Cosequin ingredients. Made by Nutramax, available online, no veterinarian approval needed. You empty the capsules in their food.
Adequan is off label for cats, approved for dogs. Needs a prescription. Very small dose is needed.
Buprenorphine/Buprenex is a narcotic, and not for long term use.
Another treatment you might consider is acupuncture. Gandalf is arthritic and receives bi-monthly Adequan injections and acupuncture treatment. His arthritis is stable and he will be 18 next month, diabetic for over 6 years.