Post-Operative Itching Management

Evidence-Based Treatment Approach

The British Association of Dermatologists recommends a hierarchy for opioid-induced itching, starting with naltrexone as first-line treatment, followed by alternative agents such as methylnaltrexone, ondansetron, droperidol, mirtazapine, or gabapentin 1
Rectal diclofenac 100 mg can be considered for general postoperative pruritus without visible skin signs 1
H1 and H2 antagonist combination therapy is mentioned for generalized pruritus of unknown origin, but not specifically for post-operative itching 1

Opioid-induced itching occurs in 20-100% of patients receiving epidural or intrathecal opioids, making it the most common cause of post-operative itching 2
The British Journal of Anaesthesia recommends identifying the underlying cause of post-operative itching, including opioid-induced, drug-induced allergic reaction, or non-specific histamine release from medications 2, 3
For suspected allergic reactions, grading the severity is crucial, with Grade I being isolated skin symptoms only, and Grade II-IV requiring immediate intervention due to multi-organ involvement 4

The British Association of Dermatologists and the British Journal of Dermatology recommend starting with naltrexone or considering ondansetron, mirtazapine, or gabapentin for opioid-induced itching 1, 2
For suspected allergic reactions, epinephrine is the first-line treatment, and antihistamines should not replace epinephrine, but rather be given after adequate resuscitation 5
The British Journal of Anaesthesia notes that antihistamines, including H2-antagonists like famotidine, do not prevent or reduce the severity of anaphylaxis and should never be prioritized over epinephrine in allergic reactions 6