Flexeril (cyclobenzaprine) is a muscle relaxant prescribed for people experiencing muscle spasms, as well as general muscle pain.

Oxycodone - a controlled drug - is prescribed for the relief of moderate to severe pain. Hydrocodone is also used for pain relief, but is usually found in small dosages mixed with another drug, such as ibuprofen.

These drugs are unrelated to cyclobenzaprine. A urine test for cyclobenzaprine will not show the presence of oxycodone or hydrocodone unless the individual has also consumed these drugs.

The presence of oxycodone in a urine test may indicate abuse of oxycodone / oxycontin, unless the person has been prescribed the drug for pain relief.