The 15-year-old has developed pruritus after being started on 4-hourly Immediate Release Morphine sulphate tablets for palliative care treatment. The on-call consultant asks you for a suitable alternative to be administered orally. Which of the following options is the most appropriate alternative?

• A. Oxycodone
• B. Hydromorphone
• C. Fentanyl
• D. Codeine

Answer: (A)

When morphine causes itching, the aim is to keep pain relief while reducing histamine-triggered pruritus. Among oral options, the best substitute is an opioid that provides similar analgesia but is less likely to provoke histamine release. Oxycodone fits this role well and is readily given by mouth, making it a practical alternative for a patient needing oral analgesia. Hydromorphone can be used orally too, but it has a higher or comparable potential for histamine-related itching in some patients, and codeine relies on variable CYP2D6 metabolism for efficacy. Fentanyl is primarily non-oral (transdermal or other routes), so it’s not the suitable oral option here. Thus, oxycodone is the most appropriate oral alternative in this scenario.