Drug interactions
Piperacillin + Tobramycin
Severity: Moderate
Piperacillin 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
Piperacillin and tobramycin act synergistically against many Gram-negative bacteria, including Pseudomonas. In severe renal impairment, piperacillin can inactivate tobramycin in vitro and in the body, which lowers aminoglycoside levels. Nephrotoxicity from tobramycin remains a concern.
What this interaction means in plain words
Piperacillin 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.
Piperacillin belongs to Anti Bacterial; Tobramycin belongs to Anti Bacterial.
Why it happens
Synergistic bacterial killing pharmacodynamically; piperacillin can chemically inactivate tobramycin when the two are mixed or accumulate in renal failure.
What to do
Do not mix in the same syringe or infusion bag. Monitor tobramycin levels and renal function, especially in renal impairment.
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 Piperacillin
- Piperacillin + Vancomycin Major
- Acetylsalicylic acid + Piperacillin Moderate
- Amikacin + Piperacillin Moderate
- Antithrombin alfa + Piperacillin Moderate
- Antithrombin iii + Piperacillin Moderate
- Argatroban + Piperacillin Moderate
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 Piperacillin with Tobramycin?
MediHelp rates the interaction as moderate. Piperacillin 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. Piperacillin and tobramycin act synergistically against many Gram-negative bacteria, including Pseudomonas. In severe renal impairment, piperacillin can inactivate tobramycin in vitro and in the body, which lowers aminoglycoside levels. Nephrotoxicity from tobramycin remains a concern.
How serious is the interaction between Piperacillin 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: Do not mix in the same syringe or infusion bag. Monitor tobramycin levels and renal function, especially in renal impairment.
What other medicines interact with Piperacillin?
MediHelp also lists interactions of Piperacillin with, for example, Vancomycin, Acetylsalicylic acid, Amikacin. The full list is on the Piperacillin page.
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