How do you spell relief? R-O-L-A-I-D-S. For extra-strength heartburn relief, turn to Rolaids Extra Strength with over 800mg of antacid. Our Dual Active formula harnesses the combined benefits of Calcium and Magnesium to effectively combat heartburn, acid indigestion, sour stomach, and upset stomach associated with these symptoms. For those moments when heartburn strikes unexpectedly, Rolaids Antacids go to work in seconds, allowing you to reclaim your day without delay. Rolaids spells relief.