Ondansetron hydrochlorideis is a selective 5 hydroxy-tryptamine 3 (5-HT3) receptor antagonist widely used as an effective antiemetic especially for the prevention of chemotherapy-induced nausea and vomiting caused by highly emetogenic drugs such as Cisplatin.) When its used in combination with corticosteroids these agents result in complete protection from acute-onset emesis is between 70% and 80% of patients so It may be considered as gold standard for this purpose. All 5-HT3 receptor antagonists have been associated with asymptomatic electrocardiogram changes but anaphylactic shock or hypersensitivity to ondansetron was rarely reported. In this paper, we report 3 cases of delayed anaphylactic reaction to the drug cited above.
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