When that burning happens and your feeling sick to your stomach and you need some relief! When you need some heartburn relief. PhysiciansCare Antacid fights everyday heart burn, acid indigestion, and upset stomach fast. Active Ingredients: Calcium Carbonate 420 mg. Sold as a box of 50 individually sealed packets. Perfect for standalone first aid or as a refill for a kit. Coated, easy to swallow tablets are packed in a perforated dispenser box to allow easy access. Available in tamper evident, individual dose packets.