Drug Hypersensitivity Reactions in the Americas: Similarities and Differences

Drugs are the most frequent cause of fatal anaphylaxis worldwide(1). The prevalence of adverse drug reactions (ADRs), including allergy, is known to be related to drug exposure frequency, gender, age, ethnicity and genetic factors, and it varies according to the classes of drugs, definitions of hypersensitivity reactions (HRs) and study design. Drug usage patterns vary significantly with time and geography, both across large countries and around the world(1-3).

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