Drug & supplement interaction

Zinc + Gatifloxacin

Gatifloxacin brand names: Tequin, Tequin Injection.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

Zinc has a moderate interaction with Gatifloxacin. Zinc can decrease the levels and clinical effects of quinolones antibiotics.

Read the full interaction report
SeverityModerate
LikelihoodProbable
EvidenceB
What do Severity, Likelihood & Evidence mean?
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Interaction report

Zinc and Gatifloxacin

Here is the interaction we found between these two, with the evidence behind it.

Moderate

QUINOLONE ANTIBIOTICS

Why this applies to Gatifloxacin

Gatifloxacin falls under QUINOLONE ANTIBIOTICS — the group Zinc interacts with.

Zinc can decrease the levels and clinical effects of quinolones antibiotics.
Quinolones form complexes with zinc in the gastrointestinal tract, reducing absorption of both the quinolone and zinc if taken at the same time. Advise patients to take these drugs at least 2 hours before, or 4-6 hours after, zinc supplements.
Severity Moderate Likelihood Probable Evidence B

Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports..

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the simple version: when you swallow zinc and gatifloxacin at the same time, the two can grab onto each other in your stomach and form a clump your body can't absorb well. The result is that less of the antibiotic actually gets into your bloodstream. That matters because gatifloxacin needs to reach a high enough level to knock out the infection. If too little is absorbed, the antibiotic may not work as well, and that can mean a lingering infection or, down the road, bacteria that are harder to treat.

The good news is the fix is all about timing, not avoiding zinc entirely. A common approach is to take gatifloxacin at least 2 hours before, or 4 to 6 hours after, your zinc supplement. This is mostly a concern with zinc pills, not the small amounts in food. Please run the exact spacing by your pharmacist or doctor first.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Blondeau JM. Expanded activity and utility of the new fluoroquinolones: a review. Clin Ther 1999;21:3-40. PubMed
  2. Lomaestro BM, Bailie GR. Absorption interactions with fluoroquinolones. 1995 update. Drug Saf 1995;12:314-33. PubMed
  3. Hansten PD, Horn JR. Drug Interactions Analysis and Management. Vancouver, WA: Applied Therapeutics Inc., 1997 and updates.
  4. Polk RE, Healy DP, Sahai J, et al. Effect of ferrous sulfate and multivitamins with zinc on absorption of ciprofloxacin in normal volunteers. Antimicrob Agents Chemother 1989;33:1841-4. PubMed

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Zinc Also Interacts With Other Medications

Zinc has 62 moderate, 4 minor known drug interactions in our database — the Gatifloxacin one above is one of them. If you take anything else, check it against the full list below.

Moderate 62 Minor 4 No known interaction 2,764 (incl. Gatifloxacin)
Taking anything else?

Check Another of Your Medications Against Zinc

Covers the 2,830 medications we’ve checked against Zinc. Pick one to open its full report.

Everything else you take

See Every Supplement That Interacts With Gatifloxacin

This page covers Zinc only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Gatifloxacin page lists 149 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), Apple (major), Arsenic (major) and Asarabacca (major).

By severity: 13 major · 115 moderate · 21 minor.

Open the Gatifloxacin interaction page

One more smart check

Taking Zinc as Part of a Dietary Supplement Product? Check It for Interactions

We hold 26,692 real supplement products containing Zinc, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Zinc. Your product may carry other ingredients that interact with Gatifloxacin too, on top of Zinc — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Zinc and Gatifloxacin Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Zinc
Top 10

#8 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Gatifloxacin
Steady interest

#2,186 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Supplement

About Zinc

What is Zinc?

Zinc
  • Zinc deficiency
  • Immune support
  • Cold symptoms
  • Acne
  • Wound healing

Zinc is an essential mineral that your body needs for immune function, wound healing, taste, and smell. Most people get enough from food, but supplements can help correct or prevent a deficiency. Taking too much zinc for too long can cause harm, so check with a pharmacist or doctor before using high-dose supplements.

Read the full Zinc monograph & all interactions
Keep checking

Other Drugs & Zinc

Browse every other medication we’ve checked against Zinc — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
62Moderate
4Minor
2,763No known interaction
62 Moderate 4 Minor 2,763 No interaction
Moderate

62 interactions

Showing 60 of 62 moderate interactions — see all 62 on the Zinc page.

Minor

4 interactions

No interaction 2,763 drugs checked — show the list

We also checked Zinc against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,763 medications checked with no known interaction — see the full Zinc list.

See the full Zinc interactions page
See every supplement checked against Gatifloxacin, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Zinc monograph › Uses, safety, and every drug interaction in one place Gatifloxacin supplement interactions › Every supplement checked against Gatifloxacin, ranked by severity Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Zinc and Gatifloxacin Together: Common Questions

Can you take Zinc with Gatifloxacin?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Zinc and Gatifloxacin interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Still Have a Question About Gatifloxacin and Zinc?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.