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Cimetidine oral

Important Note

The following information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. Consult your healthcare professional before using this drug.





This medication blocks secretion of acid from the stomach. It is used to relieve heartburn and acid indigestion.

How To Use

This medication is taken by mouth. As symptoms occur, take 2 tablets with water or follow your doctor's instructions. This medication can be taken up to 2 times per day (4 tablets in 24 hours). Do not take 4 tablets per day continuously for more than 2 weeks without your doctor's approval. If you are taking antacids in addition to this medication, stagger the doses so they are not taken at the same time. Try to space dosing of this medication and antacids by at least 2 hours.

Side Effects

Although unlikely at usual doses, headache, sleepiness, dizziness may occur as your body adjusts to the medication. Hair loss, increased sweating, anxiety, change in sex drive, and change in taste perceptions may also occur. If any of these effects continue or become bothersome, inform your doctor. Notify your doctor if you develop: a skin rash, hives, a change in heartbeat, jaundice, diarrhea, mental confusion, depression, trouble urinating, joint or muscle pain, breathing difficulty. Notify your doctor immediately if you notice: black tarry stools, "coffee ground" vomit. If you notice other effects not listed above, contact your doctor or pharmacist.


Before using this medication, tell your doctor or pharmacist your medical history, especially of: heartburn combined with lightheadedness or sweating or dizziness, chest pain or shoulder/jaw pain especially with shortness of breath, pain spreading to arms or neck or shoulders, unexplained weight loss, liver or kidney problems, other stomach problems (e.g., tumors), any allergies (including drug allergies). Elderly persons may be more sensitive to the effects of this medication. This medication should be used only if clearly needed during pregnancy. Discuss the risks and benefits with your doctor. Since small amounts of this medication are found in breast milk, consult your doctor before breast-feeding.

Drug Interactions

This medication can affect how your body responds to other medications. It is important to tell your doctor of any over-the-counter or prescription medication you may take, including: antacids, alcohol, heart medication, blood thinners, medication for anxiety, blood pressure drugs, anti-seizure drugs, drugs for diabetes, antidepressants, narcotic pain relievers, ketoconazole, itraconazole, theophylline. Cigarette smoking can affect this medication. Tell your doctor if you smoke and if you stop or start smoking while using this medication. This medication is available in both prescription and over-the-counter formulations. Do not take both at the same time. Do not start or stop any medicine without doctor or pharmacist approval.


If overdose is suspected, contact your local poison control center or emergency room immediately. Symptoms of overdose may include difficulty breathing, fast heartbeat, tremors, vomiting, restlessness, weakness, fatigue, or dizziness.


For best results, this medication is often used along with lifestyle changes such as stress-reduction programs, exercise, dietary changes and smoking cessation. Talk to your health care professional about changes you can benefit from.

Missed Dose

This medication is taken as needed. However, do not take more than 4 tablets in 24 hours.


Store at room temperature between 59 and 86 degrees F (15 to 30 degrees C) away from heat and light. Do not store in the bathroom.