Drug interactions
Granisetron + Mirtazapine
Severity: Moderate
Granisetron and Mirtazapine: 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
Mirtazapine has been linked to QT prolongation, mostly in overdose or with other risk factors. Granisetron may add a modest effect, and both drugs also affect serotonergic pathways.
What this interaction means in plain words
Granisetron and Mirtazapine 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.
Granisetron belongs to Gastrointestinal Tract; Mirtazapine belongs to Central Nervous System.
Why it happens
Additive QT prolongation; a pharmacodynamic serotonergic overlap is also possible.
What to do
Monitor the ECG in patients with cardiac risk factors and correct electrolytes. Watch for signs of serotonin toxicity such as agitation, tremor and hyperthermia.
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 Granisetron and Mirtazapine, 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 Granisetron
- Apomorphine + Granisetron Contraindicated
- Amiodarone + Granisetron Major
- Amisulpride + Granisetron Major
- Arsenic trioxide + Granisetron Major
- Artemether / lumefantrine + Granisetron Major
- Artemether + Granisetron Major
Other interactions of Mirtazapine
- Isocarboxazid + Mirtazapine Contraindicated
- Mirtazapine + Phenelzine Contraindicated
- Mirtazapine + Pimozide Contraindicated
- Mirtazapine + Procarbazine Contraindicated
- Mirtazapine + Rasagiline Contraindicated
- Mirtazapine + Selegiline Contraindicated
Frequently asked questions
Can I take Granisetron with Mirtazapine?
MediHelp rates the interaction as moderate. Granisetron and Mirtazapine 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. Mirtazapine has been linked to QT prolongation, mostly in overdose or with other risk factors. Granisetron may add a modest effect, and both drugs also affect serotonergic pathways.
How serious is the interaction between Granisetron and Mirtazapine?
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 in patients with cardiac risk factors and correct electrolytes. Watch for signs of serotonin toxicity such as agitation, tremor and hyperthermia.
What other medicines interact with Granisetron?
MediHelp also lists interactions of Granisetron with, for example, Apomorphine, Amiodarone, Amisulpride. The full list is on the Granisetron 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.
