Anyone have experience with Adequan injections for dogs?

My dog, Pogo, just turned 10 and she's starting to form arthritis in her hind left knee. We already have been giving her glucosamine tablets (Rejuvenate from Banfield) and they seem to work, albeit only slightly. The vet recommended that we consider the possibility of giving Pogo Adequan injections. Of course she told us that it works amazingly, but I wanted to find out from other pet owners exactly what sort of results we should TRULY expect. Any horrible side effects? Does Adequan only help with the pain or does it help the arthritis from worsening? I would really appreciate hearing from you guys. I can't stand to see my dog get any worse and if this really is a miracle drug, then I want to get on it right away!