Abstract
Paracetamol is a common antipyretic/analgesic and a component of many prescription and over- the- counter preparations. Hypersensitivity reactions to paracetamol appear to be increasing, but there are few prevalence data. The mechanism is poorly understood. We identified the clinical features of 32 patients with suspected paracetamol allergy, investigated the underlying mechanism and examined co-existing non-steroidal anti-inflammatory drug (NSAID) tolerance. A clinical history was taken and skin tests and an oral challenge were performed in 32 patients with suspected paracetamol allergy. Patients presented with a combination of urticaria, angio-oedema (face, hands), erythema (cutaneous features in 94%), dyspnoea (including laryngeal oedema), rhinoconjunctivitis, cough, abdominal pain and anaphylaxis. Two patients had a positive skin prick test (SPT) and unequivocal history of acute urticaria/facial angio-oedema/conjunctivitis/cough after paracetamol with no other triggers. One patient had a positive intradermal test. Oral challenge was positive in 15 of 31 patients (including self-challenge in 4), triggering (a combination of) rhinitis, conjunctivitis, pruritus, erythema, urticaria, angio-oedema, dyspnoea and abdominal pain. S...Continue Reading
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