Medically reviewed on August 11, 2017.
What is Pepcid AC?
Pepcid AC a histamine-2 blockers. This medicine works by decreasing the amount of acid the stomach produces.
Pepcid AC is used to treat and prevent ulcers in the stomach and intestines. It also treats conditions in which the stomach produces too much acid, such as Zollinger-Ellison syndrome. This medicine also treats gastroesophageal reflux disease (GERD) and other conditions in which acid backs up from the stomach into the esophagus, causing heartburn.
Pepcid AC may also be used for purposes not listed in this medication guide.
Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.
Before taking this medicine
Heartburn is often confused with the first symptoms of a heart attack. Seek emergency medical attention if you have chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating, and a general ill feeling.
Ask a doctor or pharmacist if it is safe for you to use Pepcid AC if you have other medical conditions, especially:
FDA pregnancy category B. Pepcid AC is not expected to harm an unborn baby. Do not use this medicine without a doctor's advice if you are pregnant.
Famotidine can pass into breast milk and may harm a nursing baby. You should not breast-feed while using this medicine.
How should I take Pepcid AC?
Use exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.
Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.
Although most ulcers heal within 4 weeks of Pepcid AC treatment, it may take up to 8 weeks of using this medicine before your ulcer heals. For best results, keep using the medication as directed. Talk with your doctor if your symptoms do not improve after 6 weeks of treatment.
Pepcid AC may be only part of a complete program of treatment that also includes changes in diet or lifestyle habits. Follow your doctor's instructions very closely.
Store at room temperature away from moisture, heat, and light. Do not allow the liquid medicine to freeze.
Throw away any unused Pepcid AC liquid that is older than 30 days.
What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking Pepcid AC?
Avoid drinking alcohol. It can increase the risk of damage to your stomach.
Avoid taking cimetidine (Tagamet), ranitidine (Zantac), or nizatidine (Axid) while you are taking Pepcid AC, unless your doctor has told you to.
This medication may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert.
Pepcid AC side effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using Pepcid AC and call your doctor at once if you have:
fast or pounding heartbeats with severe dizziness; or
Common side effects may include:
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
What other drugs will affect Pepcid AC?
Other drugs may interact with famotidine, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
Copyright 1996-2018 Cerner Multum, Inc. Version: 13.01.
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- Drug class: H2 antagonists
Other brands: Heartburn Relief