Drug interactions
Dichlorphenamide + Vitamin B12
Severity: Moderate
Dichlorphenamide and Vitamin B12: 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 potassium loss through its carbonic anhydrase inhibition. Cyanocobalamin can lower potassium when treating severe megaloblastic anemia because of rapid cell production, so low potassium is possible when both are used. This is mainly relevant at initiation of B12 therapy in severely deficient patients.
What this interaction means in plain words
Dichlorphenamide and Vitamin B12 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; Vitamin B12 belongs to Gastrointestinal Tract.
Why it happens
Additive hypokalemia: renal potassium wasting from carbonic anhydrase inhibition plus increased cellular potassium uptake during hematopoietic recovery after B12 replacement.
What to do
Check serum potassium before and during early B12 repletion in patients on dichlorphenamide. Replace potassium as needed.
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 Vitamin B12
Other interactions of Dichlorphenamide
Frequently asked questions
Can I take Dichlorphenamide with Vitamin B12?
MediHelp rates the interaction as moderate. Dichlorphenamide and Vitamin B12 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 potassium loss through its carbonic anhydrase inhibition. Cyanocobalamin can lower potassium when treating severe megaloblastic anemia because of rapid cell production, so low potassium is possible when both are used. This is mainly relevant at initiation of B12 therapy in severely deficient patients.
How serious is the interaction between Dichlorphenamide and Vitamin B12?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check serum potassium before and during early B12 repletion in patients on dichlorphenamide. Replace potassium as needed.
What other medicines interact with Vitamin B12?
MediHelp also lists interactions of Vitamin B12 with, for example, Chloramphenicol, Metformin, Neomycin po. The full list is on the Vitamin B12 page.
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