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DMF GI Side Effects – Diroximel Fumarate Alternative — SCE Neurology MCQ

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ModerateMultiple Sclerosis & CNS InflammationDMF GI Side Effects – Diroximel Fumarate AlternativeSCE Neurology

A 40-year-old man with known MS on dimethyl fumarate presents with persistent GI symptoms — abdominal cramps, diarrhoea, and nausea — that started with treatment initiation 3 months ago. He is taking the medication with food but symptoms persist. What management options are available?

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Correct answer: D — GI symptoms often improve over the first 2–3 months; if persistent, consider slow dose re-escalation, taking with high-fat food, or switching to diroximel fumarate (a related prodrug with fewer GI side effects)

DMF commonly causes GI side effects (nausea, diarrhoea, abdominal pain) in ~30–40% of patients, usually worst in the first month and often improving over 2–3 months. Management: taking with food (particularly high-fat meals), slow dose titration, symptomatic relief (anti-emetics, antidiarrhoeals). Diroximel fumarate (Vumerity) is a newer prodrug of monomethyl fumarate with a different formulation that causes significantly fewer GI side effects than DMF while having equivalent efficacy. Switching to diroximel fumarate is a reasonable option for persistent DMF GI intolerance. A: Persistent GI symptoms may warrant switching but are not an absolute stop. C: GI symptoms are very common. D: Long-term metoclopramide risks tardive dyskinesia. E: Increasing the dose would worsen GI effects.

Reference: DMF SmPC; Diroximel Fumarate SmPC; NICE TA320