Supplements and Ciprofloxacin.
Ciprofloxacin, sold under the brand names Ciproxin, Cipro, is classified under "quinolone" in the BNF.
Ciprofloxacin is an antibiotic, usually taken as a short course, and the supplement questions people ask most when given one have reassuring answers. Probiotics are fine to take alongside it and lower the chance of antibiotic-related diarrhoea: space a bacterial probiotic, most Lactobacillus or Bifidobacterium products, about two hours from your dose, while Saccharomyces boulardii, which is a yeast, can be taken at the same time. Vitamins and minerals are mostly not a concern with Ciprofloxacin, but the timing of minerals is: calcium, iron, magnesium and zinc bind it in the gut and can substantially reduce how much of the antibiotic you absorb, and because a standard daily multivitamin usually contains all four, take Ciprofloxacin at least two hours before, or six hours after, any multivitamin or single mineral supplement. The combinations that genuinely matter are listed below with their evidence, and they tend to be specific: supplements that thin the blood, serotonergic supplements stacked on certain antibiotics, and supplements that are really a prescription drug in disguise, such as red yeast rice, which contains the statin lovastatin. The sensible step in every case is to tell your pharmacist what you already take, which is free at any UK community pharmacy.
Below are the 10 documented pairs we have explicitly assessed against Ciprofloxacin in the Distil database: 8 caution and 2 good to know. The pairs cluster around 3 mechanisms: Mineral chelation (absorption), CYP1A2 inhibition, and Probiotic timing with antibiotics. Every call is cited to either a clinical reference (PMID) or the British National Formulary. Anything not on this list is either still to be assessed or beyond our database scope. The checker beneath surfaces assessments by supplement, and the missing-item form at the bottom of the page routes any uncatalogued supplement into our next curation pass.
Documented interactions
Last reviewed 29 October 2026. Each interaction below lists the evidence its assessment drew on: some rest on studies of the exact pair, others on mechanism evidence, where a citation may support one part of the reasoning rather than the exact combination. The evidence line on each entry says which.
Mineral chelation (absorption)
Caution Does Calcium interact with Ciprofloxacin?
Calcium binds to ciprofloxacin in the gut and can reduce how much antibiotic you absorb by around 40 percent, which may let an infection persist. Take ciprofloxacin at least two hours before, or six hours after, any calcium supplement.
Evidence: Supported by human study data.
Caution Does Iron interact with Ciprofloxacin?
Iron binds to ciprofloxacin in the gut and can cut the amount of antibiotic you absorb by more than half, which may let an infection persist. Take ciprofloxacin at least two hours before, or six hours after, any iron supplement.
Evidence: Supported by human study data.
Caution Does Magnesium interact with Ciprofloxacin?
Magnesium can bind to ciprofloxacin in the gut and sharply reduce how much antibiotic you absorb, which may let an infection persist. Take ciprofloxacin at least two hours before, or six hours after, any magnesium supplement.
Evidence: Supported by human study data.
Caution Does Magnesium Glycinate interact with Ciprofloxacin?
Magnesium can bind to ciprofloxacin in the gut and sharply reduce how much antibiotic you absorb, which may let an infection persist. Take ciprofloxacin at least two hours before, or six hours after, any magnesium supplement.
Evidence: Supported by human study data.
Caution Does Magnesium L-Threonate interact with Ciprofloxacin?
Magnesium can bind to ciprofloxacin in the gut and sharply reduce how much antibiotic you absorb, which may let an infection persist. Take ciprofloxacin at least two hours before, or six hours after, any magnesium supplement.
Evidence: Supported by human study data.
Caution Does Zinc interact with Ciprofloxacin?
Zinc may bind to ciprofloxacin in the gut and lower how much antibiotic you absorb, which could let an infection persist. Take ciprofloxacin at least two hours before, or six hours after, any zinc supplement.
Evidence: Limited human data, from small studies or case reports.
Caution Does Zinc Bisglycinate interact with Ciprofloxacin?
Zinc may bind to ciprofloxacin in the gut and lower how much antibiotic you absorb, which could let an infection persist. Take ciprofloxacin at least two hours before, or six hours after, any zinc supplement.
Evidence: Limited human data, from small studies or case reports.
CYP1A2 inhibition
Caution Does Melatonin interact with Ciprofloxacin?
Ciprofloxacin slows the liver enzyme that clears melatonin, so taking the two together may push melatonin levels higher than the dose alone suggests and lead to more next-day grogginess. A short course of ciprofloxacin is usually self-limiting, but a lower melatonin dose during the course is a sensible precaution.
Evidence: No direct study of this exact combination yet; the caution rests on a plausible mechanism or on reports involving a related medicine.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Probiotic timing with antibiotics
Good to know Does Bifidobacterium longum 1714 interact with Ciprofloxacin?
Bifidobacterium longum 1714 and ciprofloxacin are fine to use together. Bifidobacterium longum 1714 is a live bacterium, so space it about two hours away from your ciprofloxacin dose so the antibiotic does not reduce the live bacteria. The main exception is if your immune system is seriously weakened or you are critically ill in hospital, when any probiotic should be checked with your doctor first.
Evidence: Supported by human study data.
Good to know Does Probiotics interact with Ciprofloxacin?
Probiotics and ciprofloxacin are fine to use together, and probiotics may lower the chance of antibiotic-related diarrhoea. If you take a bacterial probiotic (most Lactobacillus or Bifidobacterium products), space it about two hours away from your ciprofloxacin dose so the antibiotic does not reduce the live bacteria. Saccharomyces boulardii is a yeast rather than a bacterium, so the antibiotic does not affect it and it can be taken at the same time. The main exception is if your immune system is seriously weakened or you are critically ill in hospital, when probiotics, particularly Saccharomyces boulardii, should be checked with your doctor first.
Evidence: Supported by human study data.
What this list does not say. Pairs not flagged here are not implicitly safe. They are either not yet in our database, or fall outside our inclusion scope (food-supplement interactions only; for drug-drug interactions, the BNF is authoritative). Use the checker below to surface any supplement, and submit a missing item if you take something we have not catalogued.
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How the checker decides
Every result has a source
Each pair we have assessed is cited to a published study (PMID) or the British National Formulary, so you can read the source yourself.
Four kinds of answer
Severe, caution, no known interaction, and not yet assessed. A pair we have not assessed is never shown as clear.
- Severe
- Caution
- No known interaction
- Not yet assessed
Nothing in our data is not a clearance
When nothing in our data records a problem with a pair, the result says no known interaction at typical doses, which is not a clearance: your pharmacist or GP can check the pair against your full medical history.
A full supplement review, built around you, not a generic stack.
The free checker answers one interaction question at a time. A Distil report reviews the bigger picture: your goals, diet, medications, current supplements and any blood results you provide, then shows what appears worth keeping, changing, adding or leaving out.
- what your diet already covers, so you are not adding a capsule for something food is already handling
- which evidence-graded compounds are worth considering for your goals, and which were considered but left out
- what to keep, change or stop from what you already take, plus the order to introduce anything new
- how your medications and complete supplement stack fit together, with daily timing and a clear point for reassessment
The interaction check is one section of the full report. You also get the reasoning behind each recommendation and the evidence references used.
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