Pain. I Was Given Box Of Nediclon From A Family

pain. I was given box of Nediclon from a family member returning from Mexico. I do believe it is helping my knee pain and swelling. I would like to order and try a bit longer to see how much it helps. Yes, it is arthritis. I need knee surgery on both knees but would like to try this a bit longer. How do I order more tablets. I currently am taking nothing for the arthritis.
Thank you,
Barbara Jerman