I have ms and have constant lower back. whether or not that has any relation i don't know what other medication i can take for pain. ?

What meds R U taking: In the initial stages of MS, pain is uncommon, but, as the condition deteriorates, muscles weaken, joints get unstable, posture changes and, of course, painful muscle spasms can occur. The best thing you can do is to is to get a referral to a physical therapist who has experience in treating such conditions. I also have MS. Pain meds are the treatment of last resort! Best wishes!