Do not take cimetidine if you take the following drugs:
-cisapride
-dofetilide
-pimozide

This medicine may also interact with the following medications:
-caffeine
-carbamazepine
-carmustine
-delavirdine
-female hormones, including contraceptive or birth control pills
-itraconazole
-ketoconazole
-medicines for heart rhythm problems
-phenytoin
-theophylline
-warfarin

They need to know if you have any of these conditions:
-blood in your stools (black or tarry stools) or if you have blood in your vomit
-kidney disease
-liver disease
-pain or trouble trying to swallow food
-an unusual or allergic reaction to cimetidine, other medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

Tell your doctor or health care professional if your pain does not start to get better or gets worse. You may need to take this medicine for several days before your symptoms get better. Finish the full course of tablets prescribed by your doctor or health care professional even if you feel better.

Do not take with aspirin, ibuprofen, or other antiinflammatory medicines unless directed to do so by your health care professional. These can make your condition worse.

Do not smoke cigarettes or drink alcohol. These increase irritation in your stomach and can increase the time it will take for your ulcer to heal.

If you get black, tarry stools or vomit up what looks like coffee grounds, call your doctor or health care professional right away. You may have a bleeding ulcer.

This medicine may cause a decrease in vitamin B12. You should make sure that you get enough vitamin B12 while you are taking this medicine. Discuss the foods you eat and the vitamins you take with your health care professional.

Keep out of the reach of children.

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Protect from light. Keep container tightly closed. Throw away any unused medicine after the expiration date.