Drug interactions
Dichlorphenamide + Vandetanib
Severity: Major
Dichlorphenamide and Vandetanib: 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
Vandetanib prolongs the QT interval and can cause torsades de pointes, and hypokalemia increases this risk. Dichlorphenamide commonly lowers potassium. The combination may increase arrhythmia risk.
What this interaction means in plain words
Dichlorphenamide and Vandetanib 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.
Dichlorphenamide belongs to Miscellaneous; Vandetanib belongs to Oncology.
Why it happens
Dichlorphenamide-induced hypokalemia amplifies vandetanib's QT prolongation.
What to do
Correct potassium and magnesium before starting and keep them in range, with regular ECG and electrolyte monitoring. Consider an alternative to dichlorphenamide if hypokalemia persists.
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 Dichlorphenamide
Other interactions of Vandetanib
- Amiodarone + Vandetanib Contraindicated
- Amisulpride + Vandetanib Contraindicated
- Amitriptyline + Vandetanib Contraindicated
- Anagrelide + Vandetanib Contraindicated
- Asenapine + Vandetanib Contraindicated
- Chloroquine + Vandetanib Contraindicated
Frequently asked questions
Can I take Dichlorphenamide with Vandetanib?
MediHelp rates the interaction as major. Dichlorphenamide and Vandetanib 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. Vandetanib prolongs the QT interval and can cause torsades de pointes, and hypokalemia increases this risk. Dichlorphenamide commonly lowers potassium. The combination may increase arrhythmia risk.
How serious is the interaction between Dichlorphenamide and Vandetanib?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Correct potassium and magnesium before starting and keep them in range, with regular ECG and electrolyte monitoring. Consider an alternative to dichlorphenamide if hypokalemia persists.
What other medicines interact with Dichlorphenamide?
MediHelp also lists interactions of Dichlorphenamide with, for example, Acetazolamide, Acetylsalicylic acid, Ammonium chloride. The full list is on the Dichlorphenamide page.
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