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Dimethyl fumarate
Pronounced dye-METH-il FYOO-mah-rate
Brand names: Tecfidera
Type: Immunomodulator (multiple sclerosis medicine) · All Neurology Medicines
What Dimethyl fumarate is used for
- Relapsing forms of multiple sclerosis
- Clinically isolated syndrome and active secondary progressive MS (label forms)
Common side effects
- Flushing
- Stomach pain
- Diarrhea
- Nausea
Important cautions
- Can lower white blood cell (lymphocyte) counts — counts are monitored because of a rare serious brain infection (PML) risk
- Liver tests are checked early in treatment
How it comes
Delayed-release capsules. This guide lists forms only — it never lists strengths or doses.
Toxicity lists: Dimethyl fumarate also appears on Medicines That Can Harm the Liver.
Related medicines — Neurology Medicines
Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.