Skip to main content

Drug Interactions between chlorpromazine and mexiletine

This report displays the potential drug interactions for the following 2 drugs:

Edit list (add/remove drugs)

Interactions between your drugs

Moderate

chlorproMAZINE mexiletine

Applies to: chlorpromazine and mexiletine

MONITOR: Coadministration with moderate or strong CYP450 1A2 inhibitors may increase the plasma concentrations and risk of adverse effects of chlorpromazine. The proposed mechanism is inhibition of CYP450 1A2-mediated metabolism of chlorpromazine, which has been shown to be metabolized by this isoenzyme. This interaction has been studied in vitro, but clinical data evaluating the interaction are not available.

MANAGEMENT: Until more information is available, caution is advised if chlorpromazine is used concomitantly with moderate or strong CYP450 1A2 inhibitors. Dosage adjustments as well as clinical and laboratory monitoring of chlorpromazine should be considered whenever a moderate or strong CYP450 1A2 inhibitor is added to or withdrawn from therapy. Patients should be advised to monitor for signs and symptoms of chlorpromazine-related adverse reactions.

References

  1. Cerner Multum, Inc. "UK Summary of Product Characteristics."
  2. Cerner Multum, Inc. "Australian Product Information."
  3. Wojcikowski J, Boksa J, Daniel WA (2010) "Main contribution of the cytochrome P450 isoenzyme 1A2 (CYP1A2) to N-demethylation and 5-sulfoxidation of the phenothiazine neuroleptic chlorpromazine in human liver--A comparison with other phenothiazines." Biochem Pharmacol, 80, p. 1252-9

Switch to consumer interaction data

Drug and food interactions

Moderate

chlorproMAZINE food

Applies to: chlorpromazine

GENERALLY AVOID: Concurrent use of ethanol and phenothiazines may result in additive CNS depression and psychomotor impairment. Also, ethanol may precipitate dystonic reactions in patients who are taking phenothiazines. The two drugs probably act on different sites in the brain, although the exact mechanism of the interaction is not known.

MANAGEMENT: Patients should be advised to avoid alcohol during phenothiazine therapy.

References

  1. Lutz EG (1976) "Neuroleptic-induced akathisia and dystonia triggered by alcohol." JAMA, 236, p. 2422-3
  2. Freed E (1981) "Alcohol-triggered-neuroleptic-induced tremor, rigidity and dystonia." Med J Aust, 2, p. 44-5

Switch to consumer interaction data

Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

See also

Report options

Loading...
QR code containing a link to this page

Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Medical Disclaimer