Drug interactions
Desipramine + Trifluoperazine
Severity: Major
Desipramine and Trifluoperazine: major interaction.
Last updated Sources: US FDA label
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
Both agents can prolong the QT interval, and phenothiazines may increase tricyclic concentrations through CYP2D6 inhibition. The combination raises the risk of ventricular arrhythmias, with added sedation and anticholinergic effects.
What this interaction means in plain words
Desipramine and Trifluoperazine 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.
Why it happens
Additive QT prolongation with possible metabolic inhibition of desipramine.
What to do
Avoid if possible. If both are needed, monitor the ECG and electrolytes and watch for tricyclic toxicity, adjusting the dose as needed.
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 Desipramine
- Desipramine + Disopyramide Contraindicated
- Desipramine + Dofetilide Contraindicated
- Desipramine + Ibutilide Contraindicated
- Desipramine + Isocarboxazid Contraindicated
- Desipramine + Methylene blue Contraindicated
- Desipramine + Pentamidine Contraindicated
Frequently asked questions
Can I take Desipramine with Trifluoperazine?
MediHelp rates the interaction as major. Desipramine and Trifluoperazine 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. Both agents can prolong the QT interval, and phenothiazines may increase tricyclic concentrations through CYP2D6 inhibition. The combination raises the risk of ventricular arrhythmias, with added sedation and anticholinergic effects.
How serious is the interaction between Desipramine and Trifluoperazine?
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 if possible. If both are needed, monitor the ECG and electrolytes and watch for tricyclic toxicity, adjusting the dose as needed.
What other medicines interact with Desipramine?
MediHelp also lists interactions of Desipramine with, for example, Disopyramide, Dofetilide, Ibutilide. The full list is on the Desipramine page.
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