Calcium carbonate
Brand: Tums, Os-Cal
No boxed warning on the current FDA label.
- Caution
- Binds levothyroxine, tetracyclines, and fluoroquinolones (separate by 4 hours); high calcium and kidney stones with excessive use.
Common side effects
- Constipation
- Gas and belching
- High calcium with excessive use
Key interactions
- Binds levothyroxine (separate by 4 hours), tetracyclines, and fluoroquinolones (separate by at least 2 hours)
- Reduces iron absorption
Counseling points
- Separate from levothyroxine by at least 4 hours
- Chew tablets thoroughly
- Works within minutes, unlike a proton pump inhibitor
We ask 6 questions about Calcium carbonate.Practice Calcium carbonate →Test yourself on medications like Calcium carbonate.Practice Medications →
High-yield study aid for exam prep, not a substitute for the package insert or a pharmacist’s dispensing reference.