Compare to Prilosec OTC active ingredient. Amazon Basic Care Omeprazole Delayed Release Mini Capsules 20 mg, Acid Reducer, same no-nonsense heartburn treatment in a convenient mini capsule. Smallest OTC omeprazole capsule available (based on total capsule volume measurement). Treating frequent heartburn, occurring 2 or more days per week, just became easier with this 24HR mini capsule. The active ingredient is omeprazole 20 mg, a Proton Pump Inhibitor (PPI) that deactivates pumps in the stomach lining to inhibit acid production at the source. Taken once every 24 hours for 14 days, Amazon Basic Care Omeprazole Delayed Release Mini Capsules 20 mg is not intended for immediate relief of heartburn and may take 1 to 4 days for full effect. For adults 18 years of age and older. Smallest OTC omeprazole capsule available (based on total capsule volume measurement).