Dairy products (milk, yogurt, cheese) significantly reduce the absorption of ciprofloxacin, potentially making the antibiotic ineffective against the infection being treated. The calcium in dairy binds to ciprofloxacin in the gut, preventing it from being absorbed into the bloodstream.
How This Interaction Works (Mechanism)
Ciprofloxacin forms insoluble chelation complexes with divalent and trivalent metal cations, including the calcium (Ca2+) found in dairy products. These chelation complexes cannot be absorbed through the intestinal wall, effectively removing the drug from the GI tract before it can reach the bloodstream. Dairy consumption can reduce ciprofloxacin bioavailability by 30 to 50 percent, which may result in subtherapeutic drug levels and treatment failure.
Source: Cipro (Ciprofloxacin) Prescribing Information, Bayer, 2025
Do not take ciprofloxacin with dairy products or calcium-fortified foods and beverages. Take ciprofloxacin at least 2 hours before or 6 hours after consuming dairy. This includes milk, yogurt, cheese, ice cream, and calcium-fortified juices. Ciprofloxacin can be taken with a non-dairy meal. Complete your full course of antibiotics even if you feel better.
Check More Drug Interactions
Use our free interaction checker to search thousands of drug, supplement, and food combinations.
Open Interaction CheckerFrequently Asked Questions
Ciprofloxacin and Dairy have a moderate interaction that requires caution. While some patients may take both under medical supervision, the combination can cause adverse effects. Talk to your doctor before combining these medications, and do not adjust doses on your own.
Dairy products (milk, yogurt, cheese) significantly reduce the absorption of ciprofloxacin, potentially making the antibiotic ineffective against the infection being treated. The calcium in dairy binds to ciprofloxacin in the gut, preventing it from being absorbed into the bloodstream.
Yes. Anytime you are taking multiple medications, supplements, or substances, you should inform your doctor and pharmacist. They can evaluate your specific risk factors (age, kidney function, other medications, medical conditions) and determine whether the Ciprofloxacin and Dairy combination is safe for you, or whether adjustments are needed.
Related Resources
- Supplement interactions with Ciprofloxacin on Health Britannica
- Supplement interactions with Dairy on Health Britannica
- Ciprofloxacin prices and pharmacy comparison on RxGrab
- Dairy prices and pharmacy comparison on RxGrab
- Full drug interaction checker tool
Get Drug Safety Alerts
Subscribe to receive updates on FDA warnings, new drug interactions, and patient safety information.