What Is It?: Ranitidine or Cimetidine are in a class of drugs called histamine receptor antagonists. They work by decreasing the amount of acid the stomach produces. They are used to treat and prevent ulcers in the stomach and intestines. They are also used to treat conditions in which the stomach produces too much acid and conditions in which acid comes up into the esophagus and causes heartburn, such as gastroesophageal reflux disease (GERD).

How To Use: Take ranitidine or cimetidine exactly as directed by your doctor. If you do not understand these instructions, ask your pharmacist, nurse, or doctor to explain them to you. Take each dose with a full glass of water (As much water as possible for infants). To ensure that you get the correct dose, measure the liquid form of ranitidine or cimetidine with a dose-measuring spoon or cup, not with a regular table spoon.

Possible Side Effects: If you experience any of the following serious side effects, stop taking ranitidine or cimetidine and call your doctor immediately or seek emergency medical treatment: an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives); easy or unusual bruising or bleeding; bleeding gums; irregular heartbeat; or yellowing of the skin or eyes.

Other, less serious side effects may be more likely to occur. Continue to take ranitidine or cimetidine and talk to your doctor if you experience dizziness; headache; or diarrhea, nausea, or constipation.

Storage: Keep in the original container. Keep out of the reach of children and pets. Capsules and tablets may be stored at room temperature. Some liquids should be stored in the refrigerator (see the prescription label.)  Store all medicines away from excess heat and moisture. Do NOT store in the bathroom.

Note: If you miss a dose take it as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue with the regular schedule. Do not take a double dose to make up for the missed one.