Prescription antifungal or antiyeast medications may also interfere with the action of omeprazole and should not be taken concurrently with it. Plain Language:

Omeprazole is a drug primarily used to treat the symptoms of heartburn and acid reflux. Acid reflux occurs when stomach acid shoots up into the esophagus, the tube connecting the throat to the stomach.

Although it is a prescription-only medication in many places, it is also sold over-the-counter in some countries. The drug is usually administered in a time-release tablet form, although some patients might prefer the powdered version because the tablets cannot be chewed.

Omeprazole is not an antacid (like Rolaids or Tums) and works on an entirely different principle. Unlike antacids, omeprazole is not taken to relieve symptoms of heartburn immediately. It is a drug that addresses the root cause...

The standard course of omeprazole is fourteen days. Patients who experience heartburn and other more serious symptoms for longer than three months may have a more serious condition that needs to be addressed by a physician.
Moreover, the drug has to be taken for several days before any symptom relief is noticed. Only persons with frequent heartburn, that is heartburn that occurs twice or more per week, should be taking omeprazole. Occasional heartburn is better treated with an antacid. Children should not take omeprazole. Side effects to be aware of or concerned about include chest pain, lightheadedness, sweating, dizziness, nausea, wheezing, vomiting, or stomach pain.