Drug interactions
Benzathine penicillin g + Sodium picosulfate / magnesium oxide / anhydrous citric acid
Severity: Moderate
Benzathine penicillin g 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 colonic bacteria convert to its active laxative form. Antibiotics that disrupt the colonic flora may reduce this activation and lead to poorer bowel cleansing before colonoscopy. Parenteral penicillin G has limited colonic exposure, so the effect is likely smaller than with oral antibiotics, but labeling advises caution.
What this interaction means in plain words
Benzathine penicillin g 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-induced alteration of colonic bacteria may reduce conversion of sodium picosulfate to its active metabolite.
What to do
Where possible, avoid scheduling the antibiotic course around the bowel preparation. Assess the quality of bowel cleansing and consider additional preparation if cleansing is inadequate.
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 Benzathine penicillin g
Frequently asked questions
Can I take Benzathine penicillin g with Sodium picosulfate / magnesium oxide / anhydrous citric acid?
MediHelp rates the interaction as moderate. Benzathine penicillin g 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 colonic bacteria convert to its active laxative form. Antibiotics that disrupt the colonic flora may reduce this activation and lead to poorer bowel cleansing before colonoscopy. Parenteral penicillin G has limited colonic exposure, so the effect is likely smaller than with oral antibiotics, but labeling advises caution.
How serious is the interaction between Benzathine penicillin g 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, avoid scheduling the antibiotic course around the bowel preparation. Assess the quality of bowel cleansing and consider additional preparation if cleansing is inadequate.
What other medicines interact with Benzathine penicillin g?
MediHelp also lists interactions of Benzathine penicillin g with, for example, Cholera vaccine, Microbiota, Omadacycline. The full list is on the Benzathine penicillin g page.
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