heartburn symptoms. 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was discovered in ranitidine products from a number of manufacturers, resulting in recalls; in April 2020, it was withdrawn from the United States market and suspended in Europe and Australia. Preparations Preparations of ranitidine products include oral tablets (75, 150, and 300 mg), effervescent tablets, and syrups, and injectable solutions; with doses of specific ranitidine product preparations are available over-the-counter (OTC) in various countries. In the United Kingdom, only the lowest-strength, 75-mg tablet is available to purchase without a prescription. In Australia, packs containing seven or 14 doses of the 150-mg tablet are available in supermarkets, small packs of 150-mg and 300-mg tablets are schedule 2 pharmacy medicines. Larger doses and pack sizes require a prescription. In the United States, 75- and 150-mg tablets are available OTC. Since 2017, Zantac is marketed in the U.S. by Sanofi. In India, it is sold under the brand name Rantac OD. References External links CYP3A4 inhibitors Dimethylamino compounds Furans GSK plc brands H2 receptor antagonists Hepatotoxins Nephrotoxins Nitroethenes Novartis brands Thioethers Withdrawn drugs World Health Organization essential medicines Wikipedia medicine articles ready to translate