Drug interactions
Epinephrine + Protriptyline
Severity: Major
Epinephrine and Protriptyline: 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
Protriptyline blocks norepinephrine reuptake and can potentiate the pressor and arrhythmic effects of epinephrine. Tricyclics may also affect cardiac conduction, adding to arrhythmic risk.
What this interaction means in plain words
Epinephrine and Protriptyline 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
Inhibition of neuronal norepinephrine reuptake enhances adrenergic response, with additive proarrhythmic effects.
What to do
Use the lowest effective epinephrine dose and avoid intravascular injection of local anesthetic combinations. Monitor 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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References
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 Protriptyline?
MediHelp rates the interaction as major. Epinephrine and Protriptyline 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. Protriptyline blocks norepinephrine reuptake and can potentiate the pressor and arrhythmic effects of epinephrine. Tricyclics may also affect cardiac conduction, adding to arrhythmic risk.
How serious is the interaction between Epinephrine and Protriptyline?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the lowest effective epinephrine dose and avoid intravascular injection of local anesthetic combinations. Monitor blood pressure and ECG.
What other medicines interact with Epinephrine?
MediHelp also lists interactions of Epinephrine with, for example, Isocarboxazid, Phenelzine, Tranylcypromine. The full list is on the Epinephrine page.
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