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If approved, tofersen will be the first treatment that targets a genetic cause of ALS. The FDA assigned a Prescription Drug User Fee Act action date of Jan. 25, 2023, but said it will hold an advisory committee meeting for this application.

If approved, this would be the first therapy to treat patients with Rett syndrome, a rare genetic neurological disorder mostly in girls.

Particulates were seen in a single vial, which could lead to blockage of blood vessels, including decreased blood flow to the brain, heart attack, and pulmonary embolus.