Drug interactions
Cefalexin + Sodium picosulfate / magnesium oxide / anhydrous citric acid
Severity: Moderate
Cefalexin and Sodium picosulfate / magnesium oxide / anhydrous 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
Sodium picosulfate is a prodrug that requires colonic bacteria to convert it to its active laxative metabolite. Antibiotics that suppress colonic flora may reduce this activation and lead to poorer bowel cleansing before colonoscopy.
What this interaction means in plain words
Cefalexin and Sodium picosulfate / magnesium oxide / anhydrous 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
Antibiotic suppression of colonic bacteria reduces conversion of picosulfate to its active metabolite.
What to do
Where possible, complete the antibiotic course or avoid giving it before the bowel preparation. Confirm adequate cleansing and consider an alternative non-prodrug preparation if antibiotics are required.
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 Cefalexin
- Amikacin + Cefalexin Moderate
- Avelumab + Cefalexin Moderate
- Balstilimab + Cefalexin Moderate
- Bcg vaccine live + Cefalexin Moderate
- Cefalexin + Cholera vaccine Moderate
- Cefalexin + Kanamycin Moderate
Frequently asked questions
Can I take Cefalexin with Sodium picosulfate / magnesium oxide / anhydrous citric acid?
MediHelp rates the interaction as moderate. Cefalexin and Sodium picosulfate / magnesium oxide / anhydrous 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. Sodium picosulfate is a prodrug that requires colonic bacteria to convert it to its active laxative metabolite. Antibiotics that suppress colonic flora may reduce this activation and lead to poorer bowel cleansing before colonoscopy.
How serious is the interaction between Cefalexin and Sodium picosulfate / magnesium oxide / anhydrous 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: Where possible, complete the antibiotic course or avoid giving it before the bowel preparation. Confirm adequate cleansing and consider an alternative non-prodrug preparation if antibiotics are required.
What other medicines interact with Cefalexin?
MediHelp also lists interactions of Cefalexin with, for example, Amikacin, Avelumab, Balstilimab. The full list is on the Cefalexin page.
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