Drug interactions
Lisdexamfetamine + Trifluoperazine
Severity: Moderate
Lisdexamfetamine and Trifluoperazine: moderate interaction.
Last updated
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
Trifluoperazine is a phenothiazine antipsychotic that blocks dopamine receptors and may prolong the QT interval, while lisdexamfetamine stimulates dopamine and norepinephrine release. The drugs can blunt each other's effects, and cardiac arrhythmia risk may rise in predisposed patients.
What this interaction means in plain words
Lisdexamfetamine and Trifluoperazine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Pharmacodynamic antagonism at dopaminergic pathways combined with additive cardiac effects (QT prolongation and sympathomimetic stimulation).
What to do
Monitor psychiatric status and obtain an ECG in patients with cardiac risk factors. Keep potassium and magnesium within normal range.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Lisdexamfetamine and Trifluoperazine, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Lisdexamfetamine
- Isocarboxazid + Lisdexamfetamine Contraindicated
- Linezolid + Lisdexamfetamine Contraindicated
- Lisdexamfetamine + Phenelzine Contraindicated
- Lisdexamfetamine + Procarbazine Contraindicated
- Lisdexamfetamine + Rasagiline Contraindicated
- Lisdexamfetamine + Safinamide Contraindicated
Frequently asked questions
Can I take Lisdexamfetamine with Trifluoperazine?
MediHelp rates the interaction as moderate. Lisdexamfetamine and Trifluoperazine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Trifluoperazine is a phenothiazine antipsychotic that blocks dopamine receptors and may prolong the QT interval, while lisdexamfetamine stimulates dopamine and norepinephrine release. The drugs can blunt each other's effects, and cardiac arrhythmia risk may rise in predisposed patients.
How serious is the interaction between Lisdexamfetamine and Trifluoperazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor psychiatric status and obtain an ECG in patients with cardiac risk factors. Keep potassium and magnesium within normal range.
What other medicines interact with Lisdexamfetamine?
MediHelp also lists interactions of Lisdexamfetamine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Lisdexamfetamine page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
