Drug interactions
Thioridazine + Trofinetide
Severity: Moderate
Thioridazine and Trofinetide: 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
Trofinetide is a weak CYP3A4 inhibitor, though thioridazine is cleared mainly via CYP2D6. Any rise in thioridazine exposure would matter because of its dose-related QTc prolongation, but a meaningful effect is not well established.
What this interaction means in plain words
Thioridazine and Trofinetide 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.
Thioridazine belongs to Central Nervous System; Trofinetide belongs to Central Nervous System.
Why it happens
Weak inhibition of CYP3A4 by trofinetide may modestly reduce thioridazine metabolism, though CYP2D6 is the main pathway.
What to do
Monitor the ECG and QTc, and watch for signs of thioridazine toxicity when starting trofinetide. Consider a thioridazine dose reduction if the QTc lengthens.
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 Thioridazine and Trofinetide, 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 14 days on the web. No card needed.
Other interactions of Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
Other interactions of Trofinetide
Frequently asked questions
Can I take Thioridazine with Trofinetide?
MediHelp rates the interaction as moderate. Thioridazine and Trofinetide 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. Trofinetide is a weak CYP3A4 inhibitor, though thioridazine is cleared mainly via CYP2D6. Any rise in thioridazine exposure would matter because of its dose-related QTc prolongation, but a meaningful effect is not well established.
How serious is the interaction between Thioridazine and Trofinetide?
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 the ECG and QTc, and watch for signs of thioridazine toxicity when starting trofinetide. Consider a thioridazine dose reduction if the QTc lengthens.
What other medicines interact with Thioridazine?
MediHelp also lists interactions of Thioridazine with, for example, Abiraterone, Adagrasib, Amiodarone. The full list is on the Thioridazine 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.
