"take it for back pain as needed. 100mg dose. it works but it makes you tired. no pain. some days i can&#039;t even get up cause of my back pain. only problem is when i don&#039;t take it (i try not to use pain meds too much) i get really sick. maybe its withdrawal. that part isn&#039;t fun. but after 3 days or so of not taking it, i&#039;m back to normal"