New Zealand Practice Guidelines for Opioid Substitution ...

12–14 hours after oral use of morphine or oxycodone. 24 hours after a dose of less than 40 mg of oral or intravenous methadone, or oral use of sustained release morphine or oxycodone. 24–48 hours after a dose of between 40 and 60 mg of oral or intravenous methadone. ................
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