Tinidazole and Lithium Carbonate: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Tinidazole
Lithium Carbonate
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
What happens
Elevated lithium plasma levels and lithium toxicity (weakness, tremor, excessive thirst, confusion)
Interaction Deep Dive
Tinidazole, a nitroimidazole, is chemically-related to metronidazole. Although not specifically studied with tinidazole, similar to metronidazole, concurrent administration of tinidazole and lithium may result in elevated lithium plasma levels and an increased risk of lithium intoxication. Consideration should also be given to periodically assessing serum lithium and creatinine levels after several days of concurrent therapy with tinidazole1. Also, consider monitoring patients for signs of lithium toxicity (weakness, tremor, excessive thirst, confusion) with concomitant therapy, making appropriate dose adjustments.
Why it happens (mechanism)
Potential reduced renal clearance of lithium
Literature reports
1 report — tap to read
a) Two case reports have demonstrated that the concurrent use of metronidazole (greater than or equal to 750 mg daily) and lithium may result in increased lithium concentrations and toxicity. Persistent signs of renal damage were evident 5 to 6 months after discontinuation of metronidazole therapy 2.
Common questions
Can I take Tinidazole and Lithium Carbonate together?
Elevated lithium plasma levels and lithium toxicity (weakness, tremor, excessive thirst, confusion) Always confirm with your pharmacist or prescriber before making any change.
How serious is the Tinidazole and Lithium Carbonate interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Tinidazole or Lithium Carbonate need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there anything you'd monitor while I'm on both?
References (2)
Keep reading about Tinidazole
Keep reading about Lithium Carbonate
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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