MajorMineral supplements. Calcium×Fluoroquinolone antibacterials
Updated · Methodology
Mechanism
The ciprofloxacin label describes the mechanism as chelate complex formation and names calcium explicitly. The antibiotic stays trapped in the gut and plasma levels fall short of what the organism requires. Dairy and calcium-fortified juices count the same as the supplement, although calcium from an ordinary diet does not affect absorption significantly.
Symptoms
The infection does not settle on schedule: fever persists beyond 48–72 hours, the urine culture stays positive after the course. The real consequence is not toxicity but treatment failure and selection of resistance.
Management
Ciprofloxacin 1–2 hours before calcium or at least 4 hours after, per the label. During the course the simplest arrangement is to move the supplement to dinner and take the antibiotic in the morning and mid-afternoon. H2-receptor antacids are exempt from this restriction.
Check the full regimen, not just this pair
Opens the checker with these two drugs prefilled. Add the rest of the regimen and recompute additive risks.
Summary of a multi-drug list →
Medicine list: everything you take in one place →
Sources
- AEMPS: Ficha técnica Ciprofloxacino Cinfa 250 mg comprimidos recubiertos EFG (2024)– AEMPS, CIMA, nº registro 62768, sección 4.5
- NIH Office of Dietary Supplements: Calcium – Health Professional Fact Sheet (2025)– NIH ODS, Calcium, Interactions with Medications