MAJOR — Use With Caution
FDA-documented interaction. Can precipitate opioid withdrawal. Methadone dose increases typically needed. Very careful monitoring required when starting and stopping rifampin.
Evidence level: STRONG
Rifampin can cause methadone to be eliminated much faster from your body, potentially causing opioid withdrawal symptoms. For patients on methadone maintenance for addiction, this can destabilize treatment.
Rifampin induces CYP3A4, CYP2B6, and CYP2C19 — all involved in methadone metabolism. Can reduce methadone levels by 33-68%, potentially precipitating opioid withdrawal. FDA methadone label warns.
If you take methadone and need rifampin, your methadone dose will likely need significant increase. Tell your methadone clinic about any new medications. When rifampin is stopped, methadone dose must be reduced.
Take each at their prescribed times. No major timing interaction, but both can cause GI side effects (nausea, constipation). Taking the antibiotic with food may help reduce nausea. Methadone can slow gut motility — stay hydrated and consider a stool softener during the antibiotic course.
Opioid use disorder, concurrent substance use, lower baseline methadone dose
Withdrawal symptoms: anxiety, muscle aches, runny nose, sweating, yawning, insomnia, diarrhea, goosebumps, abdominal cramps
Plan dose adjustments for both starting and stopping rifampin. Monitor for withdrawal daily. Consider alternative TB regimens. Coordinate between TB clinic and methadone program.
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.
Rifampin can cause methadone to be eliminated much faster from your body, potentially causing opioid withdrawal symptoms. For patients on methadone maintenance for addiction, this can destabilize treatment.
Take each at their prescribed times. No major timing interaction, but both can cause GI side effects (nausea, constipation). Taking the antibiotic with food may help reduce nausea. Methadone can slow gut motility — stay hydrated and consider a stool softener during the antibiotic course.
Withdrawal symptoms: anxiety, muscle aches, runny nose, sweating, yawning, insomnia, diarrhea, goosebumps, abdominal cramps
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.
Plan dose adjustments for both starting and stopping rifampin. Monitor for withdrawal daily. Consider alternative TB regimens. Coordinate between TB clinic and methadone program.
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