Drug interactions
Fosfomycin + Sodium picosulfate / magnesium oxide / anhydrous citric acid
Severity: Minor
Fosfomycin 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 must be activated by colonic bacteria, and antibacterial agents may reduce this activation and weaken bowel cleansing. A single oral fosfomycin dose has limited colonic impact, so the effect is likely small.
What this interaction means in plain words
Fosfomycin 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
Antibiotic-related suppression of colonic bacteria needed to activate sodium picosulfate.
What to do
Where possible, give the bowel preparation before starting the antibiotic. Confirm adequate bowel cleansing before the procedure.
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 Fosfomycin
- Cholera vaccine + Fosfomycin Moderate
- Fosfomycin + Metoclopramide Moderate
- Fosfomycin + Metoclopramide intranasal Moderate
- Fosfomycin + Microbiota Moderate
- Fosfomycin + Typhoid vaccine live Moderate
- Bazedoxifene / conjugated estrogens + Fosfomycin Minor
Frequently asked questions
Can I take Fosfomycin with Sodium picosulfate / magnesium oxide / anhydrous citric acid?
MediHelp rates the interaction as minor. Fosfomycin 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 must be activated by colonic bacteria, and antibacterial agents may reduce this activation and weaken bowel cleansing. A single oral fosfomycin dose has limited colonic impact, so the effect is likely small.
How serious is the interaction between Fosfomycin 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: Where possible, give the bowel preparation before starting the antibiotic. Confirm adequate bowel cleansing before the procedure.
What other medicines interact with Fosfomycin?
MediHelp also lists interactions of Fosfomycin with, for example, Cholera vaccine, Metoclopramide, Metoclopramide intranasal. The full list is on the Fosfomycin page.
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