Drug interactions
Sodium picosulfate / magnesium oxide / anhydrous citric acid + Tobramycin
Severity: Moderate
Sodium picosulfate / magnesium oxide / anhydrous citric acid and Tobramycin: 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 requires colonic bacteria to be converted to its active laxative form. Oral antibiotics that suppress the flora may reduce bowel cleansing efficacy, while systemic tobramycin has little effect on colonic bacteria. Bowel preparation can also cause dehydration and electrolyte changes that add to aminoglycoside kidney risk.
What this interaction means in plain words
Sodium picosulfate / magnesium oxide / anhydrous citric acid and Tobramycin 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 activation of picosulfate; volume depletion adds to nephrotoxic risk.
What to do
Ensure adequate hydration and monitor renal function and electrolytes in patients on tobramycin. Be alert to inadequate bowel cleansing if oral antibiotics are used.
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 Tobramycin
- Cidofovir + Tobramycin Contraindicated
- Adefovir + Tobramycin Major
- Amikacin + Tobramycin Major
- Amphotericin b deoxycholate + Tobramycin Major
- Amphotericin b + Tobramycin Major
- Atracurium + Tobramycin Major
Frequently asked questions
Can I take Sodium picosulfate / magnesium oxide / anhydrous citric acid with Tobramycin?
MediHelp rates the interaction as moderate. Sodium picosulfate / magnesium oxide / anhydrous citric acid and Tobramycin 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 requires colonic bacteria to be converted to its active laxative form. Oral antibiotics that suppress the flora may reduce bowel cleansing efficacy, while systemic tobramycin has little effect on colonic bacteria. Bowel preparation can also cause dehydration and electrolyte changes that add to aminoglycoside kidney risk.
How serious is the interaction between Sodium picosulfate / magnesium oxide / anhydrous citric acid and Tobramycin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Ensure adequate hydration and monitor renal function and electrolytes in patients on tobramycin. Be alert to inadequate bowel cleansing if oral antibiotics are used.
What other medicines interact with Tobramycin?
MediHelp also lists interactions of Tobramycin with, for example, Cidofovir, Adefovir, Amikacin. The full list is on the Tobramycin page.
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