Dosage

Oral-

Benign gastric and duodenal ulcer: 20 mg once daily for 4 weeks in duodenal ulceration, 8 weeks in gastric ulceration; in severe or recurrent cases, dose to be increased to 40 mg daily; maintenance dose for recurrent duodenal ulcer, 20 mg once daily; in the prevention of relapse in duodenal ulcer, 10-20 mg daily.

NSAID-associated duodenal or gastric ulcer: 20 mg once daily for 4 weeks, continued for further 4 weeks, if not fully healed. 20 mg once daily is used as prophylaxis in patients with a history of NSAID-associated duodenal or gastric ulcers.

Gastro-esophageal reflux disease: 20 mg once daily for 4 weeks, continued for further 4-8 weeks, if not fully healed; 40 mg once daily has been given for 8 weeks in gastro-esophageal reflux disease, refractory to other treatment; maintenance dose is 20 mg once daily.

Long-term management of acid reflux disease: 10-20 mg daily.

Acid-related dyspepsia: 10-20 mg once daily for 2-4 weeks.

Prophylaxis of acid aspiration: 40 mg on a preceding evening, then 40 mg 2-6 hours before surgery.

Zollinger-Ellison syndrome: Initially 60 mg once daily; usual range 20-120 mg daily (If the daily dose is more than 80 mg, 2 divided doses should be used).

Helicobacter pylori eradication regimen in peptic ulcer disease: Omeprazole is recommended at a dose of 20 mg twice daily in association with antimicrobial agents as detailed below: Amoxicillin 500 mg and Metronidazole 400 mg both three times a day for one week, or Clarithromycin 250 mg and Metronidazole 400 mg both twice a day for one week, or Amoxicillin 1 g and Clarithromycin 500 mg both twice a day for one week.

Pediatric use in severe ulcerating reflux esophagitis (Child>1 year): If body-weight 10-20 kg, 10-20 -mg once daily for 4-12 weeks; if body-weight over 20 kg, 20-40 mg once daily for 4-12 weeks.

Side Effects

Omeprazole is generally well tolerated. Nausea, abdominal colic, paresthesia, dizziness, and headache have been stated to be generally mild and transient and not requiring a reduction in dosage.