Omeprazole is a proton pump inhibitor (PPI) medication used to treat conditions such as gastroesophageal reflux disease (GERD), peptic ulcers, and Zollinger-Ellison syndrome. It works by reducing the amount of acid produced in the stomach, helping to relieve symptoms such as heartburn and indigestion. Omeprazole is typically taken once a day, before a meal, and is available in both prescription and over-the-counter forms.

Common side effects of omeprazole include headache, nausea, diarrhoea, and abdominal pain. It can also interact with other medications, so it's important to inform your doctor of all the drugs you are taking before starting treatment with omeprazole.

It's important to note that omeprazole should only be used under the guidance of a doctor and for the duration of time as prescribed. Long-term use of PPIs has been associated with an increased risk of certain health problems, including bone fractures, kidney disease, and infections, so it's important to discuss the risks and benefits of omeprazole with your doctor before starting treatment.

Further information about the medication:

https://www.nhs.uk/medicines/omeprazole/