Drug interactions
Methadone + Triprolidine
Severity: Major
Methadone and Triprolidine: major interaction.
Last updated Sources: Health Canada product monograph
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Taking a sedating antihistamine with methadone increases drowsiness and the risk of respiratory depression. Methadone's long half-life means these effects can persist and be delayed in onset.
What this interaction means in plain words
Methadone and Triprolidine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Methadone belongs to Musculoskeletal; Triprolidine belongs to Respiratory.
Why it happens
Additive CNS and respiratory depression.
What to do
Avoid the combination where feasible, or monitor sedation and respiratory function closely. Use a non-sedating antihistamine when an antihistamine is required.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Triprolidine
Other interactions of Methadone
- Alvimopan + Methadone Contraindicated
- Calcium / magnesium / potassium / sodium oxybates + Methadone Contraindicated
- Droperidol + Methadone Contraindicated
- Ibutilide + Methadone Contraindicated
- Isocarboxazid + Methadone Contraindicated
- Lefamulin + Methadone Contraindicated
Frequently asked questions
Can I take Methadone with Triprolidine?
MediHelp rates the interaction as major. Methadone and Triprolidine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Taking a sedating antihistamine with methadone increases drowsiness and the risk of respiratory depression. Methadone's long half-life means these effects can persist and be delayed in onset.
How serious is the interaction between Methadone and Triprolidine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination where feasible, or monitor sedation and respiratory function closely. Use a non-sedating antihistamine when an antihistamine is required.
What other medicines interact with Triprolidine?
MediHelp also lists interactions of Triprolidine with, for example, Belladonna and opium, Benzhydrocodone / acetaminophen, Brexanolone. The full list is on the Triprolidine page.
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