Methadone
From IDWiki
Background
- Full opioid agonist
- Serum levels peak 2 to 3 hours for methadone
Dosing
Initiation
META-PHI Protocol for Fentanyl
- From [1]
- May be considered in patients who are not high risk for adverse events (acute respiratory illness, sedating medications, liver or renal failure, or uncertain opioid tolerance)
- In these patients, start at 10 to 20 mg and titrate 10 mg every 3 to 5 days
- Start at 30 mg
- Increase dose by 10 to 15 mg every 3 to 5 days up to 75 to 80 mg
- Faster for people who are at lower risk for adverse events
- thereafter increase by 10 mg every 5 to 7 days
- May use SROM as adjunct with daily observed dispensing
- For missed doses:
- After 4 missed doses, reduce dose by 50% or to 30 mg (whichever is higher)
- After 5 or more missed doses, restart at 30 mg
St. Paul's Protocol
| Day | Dose |
|---|---|
| Protocol 1 | |
| 1 | 20 mg TID or 15 mg QID + 3h post-dose assessment |
| 2 | |
| 3 | |
| 4 | 70 mg daily + 10 mg q3h prn x2 doses |
| 5 | Day 4 dose, titrated every 3-4 days |
| Protocol 2 | |
| 1 | 30 mg TID + 10 mg q3h prn x3 doses + 3h post-dose assessment |
| 2 | |
| 3 | |
| 4 | 70 mg daily + 10 mg q3h prn x2 doses |
| 5 | Day 4 dose, titrated every 3-4 days |
St. Michael's Protocol
- Start methadone 40 mg and titrate up by 10 mg daily until 70 mg, then hold for 3 days
| Day | Methadone | Morphine |
|---|---|---|
| 1 | 40 mg | 30-50 mg po q2h while awake + 30-50 mg po q3h prn for mild withdrawal + 20 mg IM for severe withdrawal |
| 2 | 50 mg at 10:00 | As above + 50% of total Day 1 requirements as Kadian at 16:00 |
| 3 | 60 mg at 10:00 | Kadian Day 2 dose at 10:00; switch standing morphine to prn |
| 4 | 70 mg at 10:00 | Kadian Day 2 dose + 50% of additional morphine Day 3 dose; continue prn |
| 5 | 70 mg at 10:00 | Kadian Day 4 dose |
| 6 | 70 mg at 10:00 | Kadian Day 5 dose + 50% of additional morphine Day 5 dose |
| 7 | 85 mg at 10:00 | Kadian Day 6 dose |
CPSO Guidelines
- Patients who miss 3 or more doses must be assessed in person before getting a new prescription
- Patients who miss a dose must remain on that dose for another 3 days before considering titration
- No dose increases without assessing patient
- Patients on benzodiazepines must start at lower doses and should generally not receive carries
- Patients should not receive additional opioids except for acute pain management
- Obtain an ECG before increasing the dose above 120 mg
- ↑ Bromley L, Kahan M, Regenstreif L, Srivastava A, Wyman J. Methadone treatment for people who use fentanyl: Recommendations. Toronto, ON: META:PHI; 2021. www.metaphi.ca
