<prompt> Omeprazole effects are due to: March 2013Prostaglandin analogueH, antihistaminesProton pump inhibitorUlcer protective mechanism  <response>: Ans. C i.e. Proton pump inhibitor Omeprazole It is a proton pump inhibitor used in the treatment of: - Dyspepsia, - Peptic ulcer disease PUD, - Gastroesophageal reflux disease GORDGERD, - Laryngopharyngeal reflux LPR and - Zollinger-Ellison syndrome. 