Myoflex and Antiphlogistine are brand names of products that can help relieve muscle and joint pain. They both may contain the same active ingredient, often a topical anti-inflammatory from the salicylate family. It is important not to apply these products over a large area of the body, such as an entire leg or the entire back. If you are experiencing pain in large regions of your body, it is best to take an oral medication instead. If you have any other questions, please feel free to ask.