Does Ciprofloxacin Interact with Lanthanum Carbonate?
Ciprofloxacin and Lanthanum Carbonate have a major drug interaction according to U.S. FDA drug labeling data. Lanthanum carbonate reduces bioavailability of ciprofloxacin by approximately 50%. Administer at least 1 hour before or 4 hours after lanthanum carbonate. The mechanism involves binding to cationic antacid reduces absorption. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.
- Severity
- Major
- Ciprofloxacin Class
- Fluoroquinolone Antibacterial
- Management
- Close medical supervision required
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Ciprofloxacin and Lanthanum Carbonate occurs because binding to cationic antacid reduces absorption. Clinically, this means lanthanum carbonate reduces bioavailability of ciprofloxacin by approximately 50%. administer at least 1 hour before or 4 hours after lanthanum carbonate. This is classified as a major interaction, meaning it could cause serious harm if not properly managed. Your healthcare provider may need to adjust dosages, substitute one medication, or increase monitoring frequency.
What To Tell Your Doctor or Pharmacist
If you are taking Ciprofloxacin and your doctor is considering prescribing Lanthanum Carbonate (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask how frequently you should be monitored while these are co-prescribed
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider