Zinc and Ofloxacin Ophthalmic: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Ofloxacin Ophthalmic
Zinc
No brand names on record
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
Decreased efficacy of ofloxacin
Interaction Deep Dive
Quinolones form chelates with metal cations, including zinc. The coadministration of zinc and ofloxacin may substantially reduce the absorption of ofloxacin, resulting in lower systemic concentrations. Separate the administration of ofloxacin and zinc supplements or zinc-containing products by at least two hours1.
Why it happens (mechanism)
Decreased ofloxacin absorption due to chelation
Common questions
Can I take Zinc and Ofloxacin Ophthalmic together?
Decreased efficacy of ofloxacin Always confirm with your pharmacist or prescriber before making any change.
How serious is the Zinc and Ofloxacin Ophthalmic interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "rapid". Effects can appear quickly, often within about 24 hours of combining the drugs.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Zinc or Ofloxacin Ophthalmic 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 (1)
- Product Information: Floxin(R), ofloxacin. Ortho-McNeil Pharmaceutical, Inc. aritan, NJ, 2000. DailyMed
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