Pepcid AC Acid Reducer Maximum Strength Tablets, 100-Count. Ingredients:Maximum Strength PEPCID AC Tablets Active ingredient (in each tablet) Purpose Famotidine 20 mg Acid reducer Halt heartburn in its tracks with these maximum strength tablets. The 100 tablets reduce acid to help you stay comfortable at meal time or later. Just take 1 tablet when you know heartburn is about to hit or when it already has for relief. Do not use if you are allergic to famotidine or other acid reducers Do not use if you have trouble or pain swallowing food, vomiting with blood or bloody or black stools; these may be signs of a serious condition; see your doctor Do not use if you have kidney disease, except under the advice and supervision of your doctor Do not use with other acid reducers Ask a doctor before using if you have had heartburn for over 3 months, if you experience lightheadedness, sweating or dizziness, frequent chest pain, frequent wheezing, unexplained weight loss, nausea or vomiting, or stomach pain Stop using and ask your doctor if your heartburn continues or worsens, or if you need to take this product for more than 14 days If pregnant or breast-feeding, ask a health professional before using Keep out of reach of children