Omeprazole is a medication commonly used to treat conditions related to excess stomach acid production, such as gastroesophageal reflux disease (GERD), stomach ulcers, and Zollinger-Ellison syndrome. It belongs to a class of drugs known as proton pump inhibitors (PPIs), which work by reducing the amount of acid produced by the glands in the stomach lining.

Typically, omeprazole is taken orally, and it's available in various forms, including capsules and tablets. It's important to follow the dosage instructions provided by a healthcare professional to ensure its effectiveness and minimize potential side effects.

Common side effects can include headache, nausea, vomiting, diarrhea, stomach pain, gas, constipation, and fever. It's always a good idea to consult with a healthcare provider if you have any concerns or experience any adverse effects while taking omeprazole.