Hi, For Pain In My Lower Back, Shoulder, And One

Hi, for pain in my lower back, shoulder, and one finger with a swollen knuckle (R/Arth) etc , I take 3 t3's every third or fourth day. I am concerned about the safe of using this drug on this level. From what I gleen from google, I believe I well with-in the user safe zone, but your opinion will be appreciated.
Thanks