Drug interactions
Epinephrine + Risperidone
Severity: Major
Epinephrine and Risperidone: major 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
Risperidone blocks alpha-1 adrenergic receptors, so epinephrine given in its presence may cause unopposed beta-mediated vasodilation and a paradoxical fall in blood pressure. Both drugs can also affect cardiac rhythm and QT interval, adding to arrhythmic risk.
What this interaction means in plain words
Epinephrine 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.
Epinephrine belongs to Endocrine; Risperidone belongs to Central Nervous System.
Why it happens
Alpha-1 adrenergic blockade by risperidone reverses the pressor effect of epinephrine, plus additive proarrhythmic effects.
What to do
Avoid epinephrine for treating antipsychotic-induced hypotension, using norepinephrine or phenylephrine instead. For anaphylaxis epinephrine remains indicated, with close monitoring of blood pressure and ECG.
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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Other interactions of Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Other interactions of Epinephrine
- Epinephrine + Isocarboxazid Contraindicated
- Epinephrine + Phenelzine Contraindicated
- Epinephrine + Tranylcypromine Contraindicated
- Acebutolol + Epinephrine Major
- Amitriptyline + Epinephrine Major
- Amoxapine + Epinephrine Major
Frequently asked questions
Can I take Epinephrine with Risperidone?
MediHelp rates the interaction as major. Epinephrine 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. Risperidone blocks alpha-1 adrenergic receptors, so epinephrine given in its presence may cause unopposed beta-mediated vasodilation and a paradoxical fall in blood pressure. Both drugs can also affect cardiac rhythm and QT interval, adding to arrhythmic risk.
How serious is the interaction between Epinephrine 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 epinephrine for treating antipsychotic-induced hypotension, using norepinephrine or phenylephrine instead. For anaphylaxis epinephrine remains indicated, with close monitoring of blood pressure and ECG.
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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