Serta is a trade name for the antidepressant Sertraline. It would not cause back pain, but can help to reduce various types of pain. But for that one would need to go back to taking a routine and regular dose of it, rather than only an occasional dose. It might be useful for you to see a psychiatrist with an interest in pain problems, who might be able to advise usefully on the dose of Serta most likely to help, and to consider an alternative antidepressant to change to.
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