Drug interactions
Dosulepin + Pimozide
Severity: Major
Dosulepin and Pimozide: 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
Dosulepin is a sedating tricyclic antidepressant that can prolong the QT interval and cause anticholinergic effects. Together with pimozide, the risk of QT prolongation, ventricular arrhythmia and additive sedation increases.
What this interaction means in plain words
Dosulepin and Pimozide 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.
Dosulepin belongs to Central Nervous System; Pimozide belongs to Central Nervous System.
Why it happens
Additive QT prolongation and CNS depression and anticholinergic effects.
What to do
Avoid the combination where possible. If it is necessary, obtain a baseline and follow-up ECG, correct potassium and magnesium, and use the lowest doses.
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 Pimozide
- Adagrasib + Pimozide Contraindicated
- Amiodarone + Pimozide Contraindicated
- Amisulpride + Pimozide Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amoxapine + Pimozide Contraindicated
- Anagrelide + Pimozide Contraindicated
Other interactions of Dosulepin
- Dosulepin + Isocarboxazid Contraindicated
- Dosulepin + Phenelzine Contraindicated
- Dosulepin + Thioridazine Contraindicated
- Dosulepin + Tranylcypromine Contraindicated
- Amitriptyline + Dosulepin Major
- Buprenorphine + Dosulepin Major
Frequently asked questions
Can I take Dosulepin with Pimozide?
MediHelp rates the interaction as major. Dosulepin and Pimozide 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. Dosulepin is a sedating tricyclic antidepressant that can prolong the QT interval and cause anticholinergic effects. Together with pimozide, the risk of QT prolongation, ventricular arrhythmia and additive sedation increases.
How serious is the interaction between Dosulepin and Pimozide?
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 the combination where possible. If it is necessary, obtain a baseline and follow-up ECG, correct potassium and magnesium, and use the lowest doses.
What other medicines interact with Pimozide?
MediHelp also lists interactions of Pimozide with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Pimozide page.
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