Drug interactions
Epinephrine + Olanzapine
Severity: Major
Epinephrine and Olanzapine: 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
Olanzapine blocks alpha-1 adrenergic receptors, so if epinephrine is given for hypotension or shock, beta-mediated vasodilation may predominate and blood pressure may fall further. This paradoxical effect is classically described for antipsychotics with strong alpha-blocking activity.
What this interaction means in plain words
Epinephrine and Olanzapine 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; Olanzapine belongs to Central Nervous System.
Why it happens
Alpha-1 adrenergic blockade by olanzapine reverses the pressor effect of epinephrine, leaving unopposed beta-2 vasodilation.
What to do
If a vasopressor is needed in a patient taking olanzapine, prefer norepinephrine or phenylephrine rather than epinephrine. Monitor blood pressure closely when epinephrine is required, such as in anaphylaxis.
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 Olanzapine
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 Olanzapine?
MediHelp rates the interaction as major. Epinephrine and Olanzapine 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. Olanzapine blocks alpha-1 adrenergic receptors, so if epinephrine is given for hypotension or shock, beta-mediated vasodilation may predominate and blood pressure may fall further. This paradoxical effect is classically described for antipsychotics with strong alpha-blocking activity.
How serious is the interaction between Epinephrine and Olanzapine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: If a vasopressor is needed in a patient taking olanzapine, prefer norepinephrine or phenylephrine rather than epinephrine. Monitor blood pressure closely when epinephrine is required, such as in anaphylaxis.
What other medicines interact with Olanzapine?
MediHelp also lists interactions of Olanzapine with, for example, Amisulpride, Amoxapine, Apomorphine. The full list is on the Olanzapine page.
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