What is dimethyl fumarate?

Donna Hill Howes, RN
Family Practitioner

Dimethyl fumarate (Tecfidera) is a disease-modifying drug for treating relapsing-remitting MS. It is taken twice a day by mouth. It can be used before trying other treatments or when other drugs don't work. Dimethyl fumarate is a new drug, approved in 2013. It appears to be quite safe compared to other MS drugs. But little is known about its long-term effects.

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