Omeprazole 20mg is a medication used to treat stomach and esophagus problems caused by excessive acid production, such as acid reflux and gastroesophageal reflux disease (GERD). It belongs to a class of drugs called proton pump inhibitors, which work by reducing the amount of acid produced by the stomach. Omeprazole 20mg is also used to treat conditions such as ulcers and Zollinger-Ellison syndrome. This medication is typically taken orally once a day, with or without food, and should be taken for the full course of treatment as prescribed by your doctor. It's important to note that while omeprazole 20mg can provide relief from symptoms such as heartburn, it does not provide immediate relief and may take a few days to start working. It's also important to speak to your doctor before taking omeprazole 20mg if you are pregnant, breastfeeding, or have any other medical conditions.