New, DUO FusionTM, from the makers of Zantac, offers 2 in 1 heartburn relief in a great-tasting chewable tablet. Just one dose combines antacids, that start to neutralize acid in seconds and an acid reducer, that lasts up to 12 hours. Based on 9-hour acid control studies during the day and 12-hour acid control studies during the night. Acid control does not imply symptom relief.