You should not use this medication if you are allergic to famotidine or similar medications such as ranitidine (Zantac), cimetidine (Tagamet), or nizatidine (Axid).
Before taking famotidine, tell your doctor if you have kidney or liver disease, stomach cancer or other problems, or asthma, COPD, or other breathing problems.
Avoid taking cimetidine (Tagamet), ranitidine (Zantac), or nizatidine (Axid) while you are taking famotidine, unless your doctor has told you to.
Famotidine can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.
Famotidine 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.
Heartburn can be confused with early symptoms of heart attack. Seek emergency medical attention if you have chest pain or heavy feeling, dizziness, pain spreading to the arm or shoulder, sweating, nausea or vomiting, and a general ill feeling.