Jacobus and Catalyst Continue to Race for Approval of LEMS Drug

By Dalia Deak

The latest development in the race for approval between Jacobus Pharmaceutical Company and Catalyst Pharmaceuticals is a ‘refuse to file’ letter that the FDA issued to Catalyst indicating that Catalyst’s New Drug Application for Firdapse was incomplete. Both companies are competing for approval of slightly modified forms of a drug—3,4-diaminopyridine, or 3,4-DAP— to treat Lambert-Eaton myasthenic syndrome (LEMS). The winner will receive 7 years of exclusive marketing rights to the drug.

LEMS is an autoimmune disorder that affects an estimated 3,000 people in the United States. It is a rare, debilitating disorder that is marked by progressive weakening of the muscles that often begins in young adulthood. The drug in question was initially discovered in the 1970s in Scotland, with researchers in Sweden demonstrating its use in LEMS patients in the 1980s. Jacobus Pharmaceutical Company has been providing a free base form of the drug to patients with a LEMS diagnosis since the early 1990s at no cost (with the exception of postage), though the drug had never received FDA approval.

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