Medi-First chewable antacid tablet. Mint flavor aluminum-free calcium supplement for heartburn, sour stomach, acid indigestion and upset stomach. Each tablet contains: calcium carbonate 420-milligrams. Other information: contains phenylalanine 1.5-milligrams per tablet. Each tablet contains 168-milligrams elemental calcium. Store at room temperature in a dry place. Tamper-evident sealed packets; do not Use any opened or torn packets. Medique Products takes great care to ensure that the product you take is completely safe. Always refer to the original container for the most accurate drug facts for your particular lot number.