Author: Dr Tim Aung, Primary Care Practitioner, Brisbane. DermNet NZ Editor in Chief: Adjunct A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand. Copy edited by Gus Mitchell. April 2019.
Pruritus is the medical name for itching. Drug-induced pruritus is an itch caused or triggered by medication. There are various itchy drug eruptions, but generally, the term ‘drug-induced pruritus’ implies that no primary rash is present — just scratch marks.
The epidemiology of drug-induced pruritus is unknown. Generally, adverse drug reactions are more common in older patients and in patients taking multiple medicines.
The cause of drug-induced pruritus is often unknown and depends on the drug. It may involve:
The most commonly reported drugs to cause pruritus are opioids (especially during spinal anaesthesia), chemotherapeutic agents, and chloroquine (affecting 60–70% of black Africans prescribed this medicine).
The main groups of drugs that cause pruritus through various mechanisms are listed below.
Cessation of the causative drug is an immediate priority [1,4–6]. Treatment depends on how it causes itching and its severity.
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