Drug interactions
Dimethyl fumarate + Diroximel fumarate
Severity: Contraindicated
Dimethyl fumarate and Diroximel fumarate: contraindicated interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs are converted to the same active metabolite, monomethyl fumarate, so combining them duplicates therapy. This raises the risk of flushing, gastrointestinal effects, lymphopenia and other dose-related adverse effects.
What this interaction means in plain words
Dimethyl fumarate and Diroximel fumarate are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Dimethyl fumarate belongs to Central Nervous System; Diroximel fumarate belongs to Central Nervous System.
Why it happens
Both prodrugs yield monomethyl fumarate, producing additive exposure.
What to do
Do not use together. Diroximel fumarate may be started the day after dimethyl fumarate is stopped.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Frequently asked questions
Can I take Dimethyl fumarate with Diroximel fumarate?
MediHelp rates the interaction as contraindicated. Dimethyl fumarate and Diroximel fumarate are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Both drugs are converted to the same active metabolite, monomethyl fumarate, so combining them duplicates therapy. This raises the risk of flushing, gastrointestinal effects, lymphopenia and other dose-related adverse effects.
How serious is the interaction between Dimethyl fumarate and Diroximel fumarate?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not use together. Diroximel fumarate may be started the day after dimethyl fumarate is stopped.
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