Drug interactions
Granisetron + Macimorelin
Severity: Major
Granisetron and Macimorelin: major interaction.
Last updated Sources: US FDA label
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
Macimorelin causes QT prolongation, and granisetron can have a similar effect. Combining them may add to arrhythmia risk during the diagnostic test.
What this interaction means in plain words
Granisetron and Macimorelin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Granisetron belongs to Gastrointestinal Tract; Macimorelin belongs to Endocrine.
Why it happens
Additive prolongation of the QT interval.
What to do
Avoid giving granisetron around the time of macimorelin testing. Defer the test or use an alternative if QT-prolonging drugs cannot be held.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
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 Macimorelin
Frequently asked questions
Can I take Granisetron with Macimorelin?
MediHelp rates the interaction as major. Granisetron and Macimorelin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Macimorelin causes QT prolongation, and granisetron can have a similar effect. Combining them may add to arrhythmia risk during the diagnostic test.
How serious is the interaction between Granisetron and Macimorelin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid giving granisetron around the time of macimorelin testing. Defer the test or use an alternative if QT-prolonging drugs cannot be held.
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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