- required to suspend all current pain relief medications. Subjects that were currently taking analgesic medications were eligible to participate in the study following a 14 day washout period for NSAIDs, a 7 day washout for narcotics, and a 90 day washout for injected steroids. Subjects currently taking glucosamine, chondroitin sulfate or MSM were only eligible after a 3-month washout period.