Medication information written by Dr. Larisa Roybal, PharmD Updated – February 17, 2021 Prilosec (Omeprazole) Medication Information Uses Prilosec is a proton pump inhibitor (PPI) that is used to treat gastroesophageal reflux disease (GERD) and ulcers.  Dosage The capsules are available in several different strengths: 10 mg 20 mg 40 … Continue reading Prilosec (Omeprazole)