Drug interactions
Droperidol + Risperidone
Severity: Major
Droperidol and Risperidone: 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
Both drugs block dopamine receptors and prolong the QT interval, so combining them raises the risk of torsades de pointes and other ventricular arrhythmias. Additive sedation and a higher chance of extrapyramidal effects or neuroleptic malignant syndrome also occur. Droperidol carries a boxed warning for QT prolongation.
What this interaction means in plain words
Droperidol and Risperidone 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.
Why it happens
Additive hERG potassium channel blockade causing QT prolongation, plus additive dopamine D2 antagonism and sedative effects.
What to do
Avoid the combination where possible, especially with other QT risk factors; if it is unavoidable, obtain a baseline ECG, correct potassium and magnesium, and monitor the QTc and mental status.
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 Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Frequently asked questions
Can I take Droperidol with Risperidone?
MediHelp rates the interaction as major. Droperidol and Risperidone 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. Both drugs block dopamine receptors and prolong the QT interval, so combining them raises the risk of torsades de pointes and other ventricular arrhythmias. Additive sedation and a higher chance of extrapyramidal effects or neuroleptic malignant syndrome also occur. Droperidol carries a boxed warning for QT prolongation.
How serious is the interaction between Droperidol and Risperidone?
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 the combination where possible, especially with other QT risk factors; if it is unavoidable, obtain a baseline ECG, correct potassium and magnesium, and monitor the QTc and mental status.
What other medicines interact with Risperidone?
MediHelp also lists interactions of Risperidone with, for example, Ibutilide, Vandetanib, Adagrasib. The full list is on the Risperidone page.
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