Famotidine Max-Strength 20 mg Acid Reducer Tablets, 50 ct, QC96837 Sale! This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Compare to the Active Ingredient in Pepcid AC Maximum Strength. Relieves and prevents heartburn associated with acid indigestion and sour stomach brought on by eating or drinking certain food and beverages.