Drug interactions
Nitrofurantoin + Sodium citrate / citric acid
Severity: Moderate
Nitrofurantoin and Sodium citrate / citric acid: 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
Urinary alkalinizing agents such as sodium citrate raise urine pH, and nitrofurantoin is more active in acidic urine. This may lower antibacterial effect in the urinary tract and risk treatment failure in urinary tract infection.
What this interaction means in plain words
Nitrofurantoin and Sodium citrate / citric acid 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.
Why it happens
Urine alkalinization reduces nitrofurantoin antibacterial activity and may increase its renal elimination; reduced GI absorption is not well established.
What to do
Avoid routine use of urinary alkalinizers during nitrofurantoin therapy for UTI. If both are needed, monitor clinical response and consider an alternative antibiotic if symptoms persist.
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 Nitrofurantoin
Frequently asked questions
Can I take Nitrofurantoin with Sodium citrate / citric acid?
MediHelp rates the interaction as moderate. Nitrofurantoin and Sodium citrate / citric acid 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. Urinary alkalinizing agents such as sodium citrate raise urine pH, and nitrofurantoin is more active in acidic urine. This may lower antibacterial effect in the urinary tract and risk treatment failure in urinary tract infection.
How serious is the interaction between Nitrofurantoin and Sodium citrate / citric acid?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid routine use of urinary alkalinizers during nitrofurantoin therapy for UTI. If both are needed, monitor clinical response and consider an alternative antibiotic if symptoms persist.
What other medicines interact with Nitrofurantoin?
MediHelp also lists interactions of Nitrofurantoin with, for example, Pexidartinib, Pretomanid, Aluminum hydroxide. The full list is on the Nitrofurantoin page.
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