STOP — Contraindicated
CONTRAINDICATED — never combine two full opioid agonists
Evidence level: STRONG
Combining two opioids is extremely dangerous. Methadone has a long half-life making overdose risk particularly unpredictable.
Two full opioid agonists combined: extreme additive respiratory depression. Unpredictable dose-response with methadone long half-life.
This combination should never occur in outpatient settings. If transitioning between opioids, only under direct medical supervision.
Two opioids together requires extremely careful medical supervision. Take each exactly at prescribed times — set alarms if needed. Never take extra doses. Cumulative respiratory depression risk is significant. Keep naloxone (Narcan) accessible and ensure someone in your household knows how to use it.
Methadone long half-life (accumulation risk), opioid naive patients, concurrent CNS depressants
Respiratory arrest, extreme sedation, death
If both are prescribed, this requires specialist oversight and possible medication reconciliation.
Opioid combinations carry serious risks including respiratory depression. Talk to your pain management specialist about non-opioid alternatives: physical therapy, NSAIDs (if appropriate), nerve blocks, or non-sedating supplements like PEA (palmitoylethanolamide) or curcumin for inflammation.
Combining two opioids is extremely dangerous. Methadone has a long half-life making overdose risk particularly unpredictable.
Two opioids together requires extremely careful medical supervision. Take each exactly at prescribed times — set alarms if needed. Never take extra doses. Cumulative respiratory depression risk is significant. Keep naloxone (Narcan) accessible and ensure someone in your household knows how to use it.
Respiratory arrest, extreme sedation, death
Opioid combinations carry serious risks including respiratory depression. Talk to your pain management specialist about non-opioid alternatives: physical therapy, NSAIDs (if appropriate), nerve blocks, or non-sedating supplements like PEA (palmitoylethanolamide) or curcumin for inflammation.
If both are prescribed, this requires specialist oversight and possible medication reconciliation.
Or browse the full interaction database (121,000+ pairs).