Patienter, der modtager opioid- vedligeholdelsesbehandling, er patienter, der tager mindst 60 mg oral morfin daglig, mindst 25 mikrogram transdermal fentanyl pr. time, mindst 30 mg oxycodon daglig, mindst 8 mg oral hydromorfon daglig eller en tilsvarende analgetisk dosis af et andet opioid i en uge eller længere.
Patients receiving maintenance opioid therapy are those who are taking at least 60 mg of oral morphine daily, at least 25 micrograms of transdermal fentanyl per hour, at least 30 mg of oxycodone daily, at least 8 mg of oral hydromorphone daily or an equianalgesic dose of another opioid for a week or longer.