Ranitidine, sold under the brand name Zantac among others, is a medication that is used to decrease stomach acid production. It is commonly used in treatment of peptic ulcer disease, gastroesophageal reflux disease, and Zollinger–Ellison syndrome. It can be given by mouth, injection into a muscle, or injection into a vein. In September 2019, the probable carcinogen N-nitrosodimethylamine (NDMA) was discovered in ranitidine products from a number of manufacturers, resulting in recalls. In April 2020, it was withdrawn from the United States market and suspended in the European Union and in Australia due to these concerns.
Common side effects include headaches and pain or burning if given by injection. Serious side effects may include liver problems, a slow heart rate, pneumonia, and the potential of masking stomach cancer. It is also linked to an increased risk of Clostridium difficile colitis. It is generally safe in pregnancy. Ranitidine is an H2 histamine receptor antagonist that works by blocking histamine, thus decreasing the amount of acid released by cells of the stomach.
Ranitidine was discovered in England in 1976, and came into commercial use in 1981. It is on the World Health Organization's List of Essential Medicines. It is available as a generic medication. In 2019, it was the 53rd most commonly prescribed medication in the United States, with more than 13 million prescriptions.
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