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Anaphylaxis can give wide\u2010ranging symptoms from rhinorrhoea and urticaria to tachycardia and system\u2010wide, life\u2010threatening, anaphylactic shock. Individuals with a disorder of mast cell activation can experience many such symptoms. H<jats:sub>2<\/jats:sub>receptor antagonists, such as ranitidine, are commonly prescribed in this population. A mechanism for the reaction is proposed in the context of ranitidine, as an inverse agonist, causing upregulation of H<jats:sub>2<\/jats:sub>histamine receptors and raised histamine levels due to enzyme induction. This effect, following extended and\/or high antihistamine dosing, may have implications for other individuals with a disorder of mast cell activation, such as mastocytosis or mast cell activation syndrome. There are potential policy and patient guidance implications for primary and secondary care with respect to cessation of H<jats:sub>2<\/jats:sub>antagonists.<\/jats:p>","DOI":"10.1111\/bcp.13578","type":"journal-article","created":{"date-parts":[[2018,4,18]],"date-time":"2018-04-18T07:01:09Z","timestamp":1524034869000},"page":"1611-1616","source":"Crossref","is-referenced-by-count":7,"title":["Can<scp>H<sub>2<\/sub><\/scp>\u2010receptor upregulation and raised histamine explain an anaphylactoid reaction on cessation of ranitidine in a 19\u2010year\u2010old female? 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