Drug interactions
Dichlorphenamide + Venlafaxine
Severity: Moderate
Dichlorphenamide and Venlafaxine: moderate 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
Dichlorphenamide commonly causes hypokalemia and metabolic acidosis. Venlafaxine can rarely cause electrolyte disturbances such as hyponatremia and may prolong QT, so low potassium could heighten arrhythmia risk. The clinical impact is generally manageable with monitoring.
What this interaction means in plain words
Dichlorphenamide and Venlafaxine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Dichlorphenamide belongs to Miscellaneous; Venlafaxine belongs to Central Nervous System.
Why it happens
Dichlorphenamide causes renal potassium loss through carbonic anhydrase inhibition, which may add to the QT-prolonging potential of venlafaxine.
What to do
Monitor serum potassium, bicarbonate and sodium at baseline and periodically. Replace potassium as needed and consider an ECG if hypokalemia occurs.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Venlafaxine
- Isocarboxazid + Venlafaxine Contraindicated
- Methylene blue + Venlafaxine Contraindicated
- Phenelzine + Venlafaxine Contraindicated
- Procarbazine + Venlafaxine Contraindicated
- Rasagiline + Venlafaxine Contraindicated
- Safinamide + Venlafaxine Contraindicated
Other interactions of Dichlorphenamide
Frequently asked questions
Can I take Dichlorphenamide with Venlafaxine?
MediHelp rates the interaction as moderate. Dichlorphenamide and Venlafaxine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Dichlorphenamide commonly causes hypokalemia and metabolic acidosis. Venlafaxine can rarely cause electrolyte disturbances such as hyponatremia and may prolong QT, so low potassium could heighten arrhythmia risk. The clinical impact is generally manageable with monitoring.
How serious is the interaction between Dichlorphenamide and Venlafaxine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum potassium, bicarbonate and sodium at baseline and periodically. Replace potassium as needed and consider an ECG if hypokalemia occurs.
What other medicines interact with Venlafaxine?
MediHelp also lists interactions of Venlafaxine with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Venlafaxine page.
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