If you have certain conditions affecting the esophagus, stomach, or intestines, your healthcare provider may prescribe omeprazole (Prilosec^®). Omeprazole is part of a class of drugs known as proton pump inhibitors (PPIs), and works by decreasing the amount of acid in your stomach by blocking specific production sites. The medicine comes in the form of a capsule that is taken once or twice a day. As with any medication, it is possible to take too much omeprazole. Seek immediate medical attention if you overdose on omeprazole. Symptoms of an omeprazole overdose can include confusion, blurred vision, or a rapid heart rate.