Is dimethyl fumarate (Tecfidera) seriously harmful to the human body?

Dimethyl fumarate (Tecfidera) is generally considered a relatively safe and effective drug, but there are still some potential risks and side effects. During the use of dimethyl fumarate, some patients may experience transient gastrointestinal discomfort, such as diarrhea, nausea, abdominal pain, etc. In addition, some patients may experience minor adverse reactions such as headache, cold symptoms, and skin flushing. However, these side effects are usually short-lived and gradually lessen over a period of time. Dimethyl fumarate may cause more serious adverse reactions in a small proportion of patients, including but not limited to low white blood cell counts, abnormal liver function, and allergic reactions.