Drug interactions
Duloxetine + Granisetron
Severity: Moderate
Duloxetine and Granisetron: 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
Serotonin syndrome has been reported with 5-HT3 antagonists given alongside serotonergic antidepressants such as duloxetine. The risk is low but the reaction may be serious. Clinicians should stay alert during initiation and dose changes.
What this interaction means in plain words
Duloxetine and Granisetron 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.
Duloxetine belongs to Central Nervous System; Granisetron belongs to Gastrointestinal Tract.
Why it happens
Possible additive serotonergic effect from serotonin and norepinephrine reuptake inhibition combined with 5-HT3 antagonism; mechanism is not firmly established.
What to do
Monitor for neuromuscular, autonomic and mental status changes after starting granisetron. Discontinue the serotonergic agents and give supportive care if serotonin syndrome is suspected.
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 Granisetron
- Apomorphine + Granisetron Contraindicated
- Amiodarone + Granisetron Major
- Amisulpride + Granisetron Major
- Arsenic trioxide + Granisetron Major
- Artemether / lumefantrine + Granisetron Major
- Artemether + Granisetron Major
Other interactions of Duloxetine
- Duloxetine + Isocarboxazid Contraindicated
- Duloxetine + Linezolid Contraindicated
- Duloxetine + Methylene blue Contraindicated
- Duloxetine + Phenelzine Contraindicated
- Duloxetine + Procarbazine Contraindicated
- Duloxetine + Rasagiline Contraindicated
Frequently asked questions
Can I take Duloxetine with Granisetron?
MediHelp rates the interaction as moderate. Duloxetine and Granisetron 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. Serotonin syndrome has been reported with 5-HT3 antagonists given alongside serotonergic antidepressants such as duloxetine. The risk is low but the reaction may be serious. Clinicians should stay alert during initiation and dose changes.
How serious is the interaction between Duloxetine and Granisetron?
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 for neuromuscular, autonomic and mental status changes after starting granisetron. Discontinue the serotonergic agents and give supportive care if serotonin syndrome is suspected.
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.
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