Use

For therapeutic drug monitoring of oxycodone (Oxycontin®, Percocet®, Percodan®). Oxycodone is a semisynthetic opioid analgesic. Steady‑state concentration is reached in 24–36 hours after initiation of therapy. Elimination half‑life of oxycodone is approximately 4.5 hours for controlled‑release and 3.2 hours for immediate‑release formulations. Oxymorphone is a minor but active metabolite present at lower concentrations. Therapeutic concentrations for oxymorphone have not been established.