The leading prescription acid reducer (omeprazole). Plus a second ingredient (sodium bicarbonate) that protects the powerful medicine from acid in the stomach allowing absorption of this omeprazole product. It contains a Proton Pump Inhibitor (PPI) the only kind of medicine specifically indicated to treat frequent heartburn. Just one capsule a day offers 24-hour relief from frequent heartburn. It blocks the production of acid that causes frequent heartburn.