Drug interactions
Piperacillin + Willow bark
Severity: Minor
Piperacillin and Willow bark: 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
Willow bark contains salicin, which is converted to salicylate, so it may share the salicylate interactions with penicillins. Effects on levels and bleeding are theoretical and likely small.
What this interaction means in plain words
Piperacillin and Willow bark 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
Salicylate competition for renal tubular secretion and protein binding; possible additive antiplatelet effect.
What to do
No routine change is needed. Monitor for bleeding if willow bark is used regularly or at high doses.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Piperacillin and Willow bark, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
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
Frequently asked questions
Can I take Piperacillin with Willow bark?
MediHelp rates the interaction as minor. Piperacillin and Willow bark have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Willow bark contains salicin, which is converted to salicylate, so it may share the salicylate interactions with penicillins. Effects on levels and bleeding are theoretical and likely small.
How serious is the interaction between Piperacillin and Willow bark?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine change is needed. Monitor for bleeding if willow bark is used regularly or at high doses.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
