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Does Metronidazole Interact with Busulfan?

Metronidazole and Busulfan have a contraindicated drug interaction according to U.S. FDA drug labeling data. Metronidazole increases plasma concentrations of busulfan, resulting in increased risk for serious busulfan toxicity. Should not be administered concomitantly unless benefit outweighs risk. The mechanism involves increase in plasma busulfan concentrations. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.

Severity
Contraindicated
Metronidazole Class
Nitroimidazole Antimicrobial
Busulfan Class
Alkylating Drug
Management
Do not take together
Data Source
U.S. FDA via OpenFDA

How This Interaction Works

The interaction between Metronidazole and Busulfan occurs because increase in plasma busulfan concentrations. Clinically, this means metronidazole increases plasma concentrations of busulfan, resulting in increased risk for serious busulfan toxicity. should not be administered concomitantly unless benefit outweighs risk. Because of the severity of this interaction, these medications are contraindicated — meaning they should not be taken together under any circumstances. If you are currently taking both, contact your healthcare provider immediately to discuss alternatives.

What To Tell Your Doctor or Pharmacist

If you are taking Metronidazole and your doctor is considering prescribing Busulfan (or vice versa), make sure to:

  • Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
  • Ask whether the benefits of combining these medications outweigh the risks for your specific situation
  • Ask what symptoms to watch for that would indicate the interaction is causing problems
  • Ask about alternative medications that do not interact with your current regimen
  • Ask how frequently you should be monitored while these are co-prescribed
  • Never stop or change either medication without first consulting your healthcare provider
💊 Metronidazole+💊 Busulfan(Busulfan)

Severity & Interaction Details

⛔
contraindicated
Avoid this combination
FDA labeling lists this pair as contraindicated. The risk outweighs the benefit in nearly all cases.
Severity scale
MinorContra
On record
Yes
Drug A class
Nitroimidazole Antimicrobial
Drug B class
Alkylating Drug
Source
NLP:metronidazole

What this means in plain English

Metronidazole increases plasma concentrations of busulfan, resulting in increased risk for serious busulfan toxicity. Should not be administered concomitantly unless benefit outweighs risk.

What the FDA label says

"Increase in plasma busulfan concentrations"

📖 Source: NLP:metronidazole

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Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine. For informational purposes only. Always consult your pharmacist or physician.