Famotidine is known as an H2 blocker. It works by reducing the amount of acid in your stomach. It is used to prevent and treat heartburn and other symptoms caused by too much acid in the stomach
Before taking famotidine, tell your doctor or pharmacist if you are allergic to it; or to other H2 blockers (e.g., cimetidine, ranitidine); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. If you have any of the following health problems, consult your doctor or pharmacist before using this medication: kidney problems, liver problems, other stomach problems (e.g., tumors). Some symptoms may actually be signs of a more serious condition. Get medical help right away if you have: heartburn with lightheadedness/sweating/dizziness, chest/jaw/arm/shoulder pain (especially with shortness of breath, unusual sweating), unexplained weight loss. In addition, before you self-treat with this medication, get medical help right away if you have any of these signs of a serious condition: trouble/pain swallowing food, bloody vomit, vomit that looks like coffee grounds, bloody/black stools, heartburn for over 3 months, frequent chest pain, frequent wheezing (especially with heartburn), nausea/vomiting, stomach pain.
Headache, Constipation, or Diarrhea may occur. Serious side effects are Easy Bruising/Bleeding, signs of Infection (such as Sore throat that doesn’t go away, Fever, Chills), Mental/Mood changes (e.g., Restlessness, Confusion, Depression, allucinations) and Allergic reactions.