Answer:
Neither of them do. Flexeril is cyclobenzaprine, a muscle relaxer, and Tramadol is a fully synthetic drug which acts like an opioid but is not actually an opiate/opioid. There is a big misconception that Tramadol will show positive on a drug test. Depending on what type of test is used, for example, a home test may show a false positive, whereas a lab test will show negative.