Acid reflux and gastroesophageal reflux disease (GERD) are two disorders involving excessive stomach acid production that are typically treated and managed with omeprazole. Although it helps lessen acid reflux symptoms like heartburn and regurgitation, its main goal is to decrease stomach acid production. Omeprazole is not officially prescribed for stopping vomiting in general, although in certain circumstances, treating underlying acid reflux symptoms may indirectly assist in reducing vomiting.