It is used to treat certain stomach and esophagus problems (such as acid reflux, ulcers).

Headache or abdominal pain may occur.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: liver disease, lupus or hypersensitivity to the drug.

Before taking omeprazole, tell your doctor or pharmacist if you are allergic to it; or to similar drugs (such as esomeprazole, lansoprazole, pantoprazole); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

If you are self-treating with this medication, over-the-counter omeprazole products are used to treat frequent heartburn (occurring 2 or more days a week). Since it may take 1 to 4 days to have full effect, these products do not relieve heartburn right away.

Do not crush, break, or chew the tablets. Swallow this medication whole with a glass of water.

If needed, antacids may be taken along with this medication. If you are also taking sucralfate, take omeprazole at least 30 minutes before sucralfate.

Please consult your doctor when taking this medicine if you are pregnant.

Drugs that may interact with this drug are Cilostazol, clopidogrel, methotrexate(especially high-dose treatment), rifampin, St John's wort.