Drug interactions
Protriptyline + Sotalol
Severity: Major
Protriptyline and Sotalol: 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, a tricyclic antidepressant, can prolong QT and slow cardiac conduction, and sotalol adds to the risk of torsades de pointes. Protriptyline also has notable heart rate effects, which may compound the bradycardia or arrhythmic risk.
What this interaction means in plain words
Protriptyline and Sotalol 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 QT prolongation through cardiac potassium channel blockade.
What to do
Avoid if possible and consider an antidepressant with less cardiac effect. If used together, check baseline and follow-up ECGs and keep potassium and magnesium normal.
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 Sotalol
- Arsenic trioxide + Sotalol Contraindicated
- Artemether / lumefantrine + Sotalol Contraindicated
- Disopyramide + Sotalol Contraindicated
- Dofetilide + Sotalol Contraindicated
- Dronedarone + Sotalol Contraindicated
- Droperidol + Sotalol Contraindicated
Frequently asked questions
Can I take Protriptyline with Sotalol?
MediHelp rates the interaction as major. Protriptyline and Sotalol 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, a tricyclic antidepressant, can prolong QT and slow cardiac conduction, and sotalol adds to the risk of torsades de pointes. Protriptyline also has notable heart rate effects, which may compound the bradycardia or arrhythmic risk.
How serious is the interaction between Protriptyline and Sotalol?
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 if possible and consider an antidepressant with less cardiac effect. If used together, check baseline and follow-up ECGs and keep potassium and magnesium normal.
What other medicines interact with Sotalol?
MediHelp also lists interactions of Sotalol with, for example, Arsenic trioxide, Artemether / lumefantrine, Disopyramide. The full list is on the Sotalol page.
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