Drug interactions
Iobenguane i + Trimipramine
Severity: Major
Iobenguane i and Trimipramine: 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
Tricyclic antidepressants block the noradrenaline transporter through which iobenguane is taken up into target tissue. This can reduce tracer uptake and produce false-negative scans or reduced therapeutic effect.
What this interaction means in plain words
Iobenguane i and Trimipramine 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 the norepinephrine transporter reduces cellular uptake of iobenguane.
What to do
If clinically possible, stop trimipramine for several half-lives before iobenguane imaging or therapy, following labeling. Do not interpret negative imaging as reliable if it was not stopped.
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 Trimipramine
- Disopyramide + Trimipramine Contraindicated
- Dofetilide + Trimipramine Contraindicated
- Ibutilide + Trimipramine Contraindicated
- Isocarboxazid + Trimipramine Contraindicated
- Pentamidine + Trimipramine Contraindicated
- Phenelzine + Trimipramine Contraindicated
Frequently asked questions
Can I take Iobenguane i with Trimipramine?
MediHelp rates the interaction as major. Iobenguane i and Trimipramine 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. Tricyclic antidepressants block the noradrenaline transporter through which iobenguane is taken up into target tissue. This can reduce tracer uptake and produce false-negative scans or reduced therapeutic effect.
How serious is the interaction between Iobenguane i and Trimipramine?
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 clinically possible, stop trimipramine for several half-lives before iobenguane imaging or therapy, following labeling. Do not interpret negative imaging as reliable if it was not stopped.
What other medicines interact with Trimipramine?
MediHelp also lists interactions of Trimipramine with, for example, Disopyramide, Dofetilide, Ibutilide. The full list is on the Trimipramine page.
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