Medication·Interactions & depletion·Reviewed June 9, 2026
Metronidazole interactions.
Metronidazole has 4 documented interactions in the NutriStack database, including 1 flagged to avoid or as a serious conflict. Prolonged use is also associated with lower Vitamin K. The full interaction list, depletion table, and replacement suggestions are below. None of this is a substitute for your prescriber's advice.
Metronidazole at a glance.
A quick, data-grounded summary. The full tables are below.
Metronidazole has 4 documented interactions in the NutriStack database, including 1 flagged to avoid or as a serious conflict. Prolonged use is also associated with lower Vitamin K. The full interaction list, depletion table, and replacement suggestions are below. None of this is a substitute for your prescriber's advice.
Substances that interact with metronidazole.
Every supplement and medication in the NutriStack database with a documented interaction with this drug, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| Alcohol | Contraindicated | Metronidazole inhibits acetaldehyde dehydrogenase, and concurrent alcohol can trigger a disulfiram-like reaction including flushing, severe nausea,... details → |
| Lactobacillus Rhamnosus | Synergy | Lactobacillus rhamnosus GG reduces antibiotic-associated diarrhea during metronidazole therapy and helps restore gut microbiome balance disrupted by... details → |
| Probiotics | Synergy | Probiotic supplementation during metronidazole therapy reduces antibiotic-associated diarrhea and helps preserve gut microbiome diversity. This is... details → |
| Saccharomyces Boulardii | Synergy | Saccharomyces boulardii is a yeast probiotic with strong evidence for preventing antibiotic-associated diarrhea, and it is unaffected by... details → |
What metronidazole can deplete.
Nutrients this medication is associated with lowering over time, with the mechanism, a suggested replacement where one applies, and the biomarker to monitor. Discuss any replacement with your prescriber first.
| Nutrient | Severity | How it happens | Replace with | Monitor |
|---|---|---|---|---|
| Vitamin K | Mild | Broad-spectrum antibiotic exposure can suppress gut bacteria that synthesize menaquinones, lowering vitamin K availability in susceptible patients. | – | PT/INR |
The full metronidazole profile.
Uses, typical dosing, side effects, and the cited evidence for this medication.
Common metronidazole questions.
Quick answers drawn from the tables above.
What interacts with Metronidazole?
In the NutriStack database, Metronidazole has 4 documented interactions. The most notable include Alcohol, Lactobacillus Rhamnosus, Probiotics, and Saccharomyces Boulardii. Check any specific combination before taking it and confirm with your prescriber.
Which substances should I avoid with Metronidazole?
Metronidazole is flagged against 1 substance in the database, including Alcohol. These pairings carry a higher risk and should be reviewed with a clinician before combining.
Does Metronidazole deplete any nutrients?
Metronidazole is associated with lowering Vitamin K with prolonged use. Useful biomarkers to monitor include PT/INR. Ask your prescriber before adding any replacement supplement.
Is it safe to take Alcohol with Metronidazole?
NutriStack classifies the Alcohol and Metronidazole pairing as contraindicated: Metronidazole inhibits acetaldehyde dehydrogenase, and concurrent alcohol can trigger a disulfiram-like reaction including flushing, severe nausea, vomiting, headache,... Do not drink alcohol while taking metronidazole. Wait at least 3 days (72 hours) after your last dose before consuming alcohol, including alcohol in... Always confirm with your prescriber.
Check your whole stack
See how metronidazole fits your supplements.
NutriStack screens your full routine for interactions and depletions, and updates the moment you change it.