Ingredient in MS, Psoriasis Drugs Linked to Two Deadly Brain Infections

April 8, 2015 9:00 PM

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WEDNESDAY, April 8, 2015 (HealthDay News) -- An active ingredient in some psoriasis and multiple sclerosis medications has been linked to two cases of a rare and sometimes lethal brain infection.

The ingredient, dimethyl fumarate, appears to have contributed to the deaths of two European women. The women contracted progressive multifocal leukoencephalopathy, or PML, according to two letters published in the April 9 issue of the New England Journal of Medicine.

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