Active substance
Antacid Calcium Carbonate
3 products from 3 companies contain this in United States.
3 without prescriptionTablet, Chewable
Available without a prescription
Berkley Jensen Ultra Strength1000 mgWithout prescription BJWC · Antacid Calcium CarbonateLeader Ultra Strength1000 mgWithout prescription CARDINAL HEALTH 110, LLC. DBA LEADER · Antacid Calcium CarbonateRegular Strength Assorted Flavors500 mgWithout prescription AKRON PHARMA INC · Antacid Calcium Carbonate
Same substance is not the same product. Strength, form, release mechanism and other ingredients all differ. Whether one can replace another is a decision for a pharmacist.