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Syringe Driver Compatibility — SCE Medical Oncology MCQ

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ModerateSupportive & Palliative OncologySyringe Driver CompatibilitySCE Medical Oncology

A 62-year-old man with advanced cancer on a syringe driver containing morphine and midazolam develops myoclonic jerks. The palliative care team consider whether the syringe driver drug combination could be contributing. What is important about syringe driver drug compatibility?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: E — Not all drug combinations are physically compatible in a syringe driver — precipitation, crystallisation or chemical degradation can occur; compatibility must be checked against reference tables (PCF, Palliative Care Formulary) before mixing drugs in a single syringe

Syringe driver drug compatibility is a critical practical consideration in palliative care. Common combinations (morphine + midazolam + haloperidol; morphine + hyoscine butylbromide + midazolam) are well-established as compatible. However, some combinations cause precipitation (e.g. cyclizine + some opioids at higher concentrations, dexamethasone with several drugs). The Palliative Care Formulary and local compatibility charts should always be consulted. Incompatible drugs should be given in separate syringe drivers or by alternative routes.

Reference: Palliative Care Formulary; NICE NG31; PCF Drug Compatibility Charts