Drug interactions
Nitrofurantoin + Sodium picosulfate / magnesium oxide / anhydrous citric acid
Severity: Minor
Nitrofurantoin and Sodium picosulfate / magnesium oxide / anhydrous citric acid: minor 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
Sodium picosulfate needs colonic bacteria to be converted to its active laxative form. Antibacterials can disrupt this flora and may reduce bowel cleansing before colonoscopy. Nitrofurantoin is mostly absorbed and urinary-excreted, so the effect is likely smaller than with broad-spectrum antibiotics.
What this interaction means in plain words
Nitrofurantoin and Sodium picosulfate / magnesium oxide / anhydrous citric acid have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Possible reduction of colonic bacterial conversion of picosulfate to its active metabolite; nitrofurantoin has limited colonic exposure.
What to do
Be aware that bowel preparation may be less effective; assess bowel cleansing adequacy before the procedure. Consider timing or an alternative preparation if cleansing is poor.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Nitrofurantoin
Frequently asked questions
Can I take Nitrofurantoin with Sodium picosulfate / magnesium oxide / anhydrous citric acid?
MediHelp rates the interaction as minor. Nitrofurantoin and Sodium picosulfate / magnesium oxide / anhydrous citric acid have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Sodium picosulfate needs colonic bacteria to be converted to its active laxative form. Antibacterials can disrupt this flora and may reduce bowel cleansing before colonoscopy. Nitrofurantoin is mostly absorbed and urinary-excreted, so the effect is likely smaller than with broad-spectrum antibiotics.
How serious is the interaction between Nitrofurantoin and Sodium picosulfate / magnesium oxide / anhydrous citric acid?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Be aware that bowel preparation may be less effective; assess bowel cleansing adequacy before the procedure. Consider timing or an alternative preparation if cleansing is poor.
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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