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LB Muscle and Back Relief XSTR is specially formulated to provide fast-acting, extra strength relief from muscle aches, back pain, and minor arthritis discomfort. Combining a powerful dose of acetaminophen with a muscle relaxant, this medication works to ease both pain and tension, making it ideal for relieving tough muscular and skeletal pain. The non-drowsy formula is suitable for daytime use, helping you stay active while managing discomfort effectively.