Uses. Common side effects include headache, intestinal upset, and dizziness. Although not all of these side effects may occur, if they do occur they may need medical attention.Check with your doctor immediately if any of the following side effects occur while taking famotidine: Do not allow the Throw away any unused liquid that is older than 30 days.Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. For the prescription form, there is more medicine in each tablet. Select one or more newsletters to continue. Our general interest e-newsletter keeps you up to date on a wide variety of health topics.Famotidine is used to treat stomach ulcers (gastric and duodenal), erosive esophagitis (heartburn or acid indigestion), and gastroesophageal reflux disease (GERD). This product is available in the following dosage forms:Portions of this document last updated: Sept. 01, 2020Copyright © 2020 IBM Watson Health. Seek emergency medical attention if you have chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, and a general ill feeling.You should not use Pepcid if you are allergic to famotidine or similar medicines such as To make sure Pepcid is safe for you, tell your doctor or pharmacist if you have ever had:Use Pepcid exactly as directed on the label, or as prescribed by your doctor.Measure liquid medicine carefully. Any use of this site constitutes your agreement to the Terms and Conditions and Privacy Policy linked below. Pepcid is used to treat and prevent ulcers in the stomach and intestines. Famotidine is known as an H2 blocker. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).Most ulcers heal within 4 weeks of famotidine treatment, but it may take up to 8 weeks of using this medicine before your ulcer heals. It works by decreasing the amount of acid produced by the stomach. GERD is a condition where the acid in the stomach washes back up into the esophagus. You could have more side effects. H2 Blockers in PEPCID® products will lower the amount of acid your stomach produces, while providing lasting relief that starts to work fast. When PEPCID was given after breakfast, the basal daytime interdigestive pH at 3 and 8 hours after 20 or 40 mg of PEPCID was raised to about 5. PEPCID to mean values of 5.0 and 6.4, respectively. It is used to treat peptic ulcer disease, gastroesophageal reflux disease, and Zollinger-Ellison syndrome. It is also used to treat certain conditions where there is too much acid in the stomach (eg, Zollinger-Ellison syndrome, multiple endocrine neoplasia). Information is for End User's use only and may not be sold, redistributed or otherwise used for commercial purposes.Mayo Clinic does not endorse companies or products. Version: 17.01The easiest way to lookup drug information, identify pills, check interactions and set up your own personal medication records. HOW SUPPLIED. Do not take two doses at one time.Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.Avoid drinking alcohol. It can increase the risk of damage to your stomach.Avoid taking other stomach acid reducers unless your doctor has told you to. It begins working within an hour. PEPCID had little or no effect on fasting or postprandial serum gastrin levels. Applies to famotidine: oral powder for suspension, oral tabletAlong with its needed effects, famotidine (the active ingredient contained in Pepcid) may cause some unwanted effects. Famotidine is used to treat stomach ulcers (gastric and duodenal), erosive esophagitis (heartburn or acid indigestion), and gastroesophageal reflux disease (GERD). Other drugs may interact with famotidine, including prescription and over-the-counter medicines, Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use Pepcid only for the indication prescribed.Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.Copyright 1996-2020 Cerner Multum, Inc. Drugs.com provides accurate and independent information on more than 24,000 prescription drugs, over-the-counter medicines and natural products. You may report side effects to FDA at 1-800-FDA-1088.Famotidine can make it harder for your body to absorb other medicines you take by mouth.