Drug interactions
Paliperidone + Trimethoprim
Severity: Moderate
Paliperidone and Trimethoprim: 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
Paliperidone prolongs the QT interval, and trimethoprim, especially with sulfamethoxazole, has been reported to cause QT prolongation and hyperkalemia. Hyperkalemia and other electrolyte disturbances could add to arrhythmic risk.
What this interaction means in plain words
Paliperidone and Trimethoprim 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.
Paliperidone belongs to Central Nervous System; Trimethoprim belongs to Anti Bacterial.
Why it happens
Possible additive QT prolongation, with trimethoprim-related hyperkalemia as an added contributor.
What to do
Check potassium and renal function and obtain an ECG in patients with additional risk factors. Consider an alternative antibiotic in high-risk patients.
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?
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Other interactions of Paliperidone
- Ibutilide + Paliperidone Contraindicated
- Paliperidone + Pimozide Contraindicated
- Paliperidone + Vandetanib Contraindicated
- Adagrasib + Paliperidone Major
- Amiodarone + Paliperidone Major
- Amisulpride + Paliperidone Major
Other interactions of Trimethoprim
Frequently asked questions
Can I take Paliperidone with Trimethoprim?
MediHelp rates the interaction as moderate. Paliperidone and Trimethoprim 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. Paliperidone prolongs the QT interval, and trimethoprim, especially with sulfamethoxazole, has been reported to cause QT prolongation and hyperkalemia. Hyperkalemia and other electrolyte disturbances could add to arrhythmic risk.
How serious is the interaction between Paliperidone and Trimethoprim?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check potassium and renal function and obtain an ECG in patients with additional risk factors. Consider an alternative antibiotic in high-risk patients.
What other medicines interact with Paliperidone?
MediHelp also lists interactions of Paliperidone with, for example, Ibutilide, Pimozide, Vandetanib. The full list is on the Paliperidone page.
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