Drug interactions
Rifaximin + Sodium picosulfate
Severity: Moderate
Rifaximin and Sodium picosulfate: 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
Sodium picosulfate is a prodrug activated by colonic bacteria. Rifaximin is a gut-active antibiotic that suppresses colonic flora and may reduce conversion to the active laxative, impairing bowel cleansing before colonoscopy.
What this interaction means in plain words
Rifaximin and Sodium picosulfate 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
Rifaximin reduces colonic bacterial flora needed to convert sodium picosulfate into its active metabolite.
What to do
Avoid rifaximin before bowel preparation where possible or consider holding it. Confirm adequate cleansing and consider an alternative non-prodrug preparation if rifaximin is essential.
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 Rifaximin
- Cholera vaccine + Rifaximin Major
- Microbiota + Rifaximin Major
- Amiodarone + Rifaximin Moderate
- Bcg intravesical live + Rifaximin Moderate
- Cyclosporine + Rifaximin Moderate
- Cyclosporin + Rifaximin Moderate
Frequently asked questions
Can I take Rifaximin with Sodium picosulfate?
MediHelp rates the interaction as moderate. Rifaximin and Sodium picosulfate 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. Sodium picosulfate is a prodrug activated by colonic bacteria. Rifaximin is a gut-active antibiotic that suppresses colonic flora and may reduce conversion to the active laxative, impairing bowel cleansing before colonoscopy.
How serious is the interaction between Rifaximin and Sodium picosulfate?
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 rifaximin before bowel preparation where possible or consider holding it. Confirm adequate cleansing and consider an alternative non-prodrug preparation if rifaximin is essential.
What other medicines interact with Rifaximin?
MediHelp also lists interactions of Rifaximin with, for example, Cholera vaccine, Microbiota, Amiodarone. The full list is on the Rifaximin page.
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