Does Tetrabenazine Interact with Chlorpromazine?
CDI records a major classification for Tetrabenazine and Chlorpromazine. The stored summary is: Antipsychotic that prolongs QTc interval and increases risk for Parkinsonism, NMS, and akathisia when used concomitantly with tetrabenazine. The mechanism involves qtc prolongation; dopamine antagonism. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This record was extracted from drug labeling through openFDA. NIH/NLM RxNorm is used for drug identities. The summary and severity classification are CDI's processed information, not a verbatim source quotation. Product, route, and patient circumstances matter.
- Severity
- Major
- Tetrabenazine Class
- Vesicular Monoamine Transporter 2 Inhibitor
- Management
- Close medical supervision required
- Data Source
- U.S. FDA via OpenFDA
Recorded Mechanism
QTc prolongation; dopamine antagonism
What To Tell Your Doctor or Pharmacist
If you are taking Tetrabenazine and your doctor is considering prescribing Chlorpromazine (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask how frequently you should be monitored while these are co-prescribed
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider