FDA Approves Zanvastro as First Treatment for Alexander Disease

FDA approves Zanvastro, the first therapy targeting the underlying cause of Alexander disease.

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As of 2026-09-03 20:45 UTC. Market figures are as the cited sources reported them at that time and may have moved since. This is news, not investment advice.

The U.S. Food and Drug Administration approved Zanvastro (zilganersen) injection for the treatment of Alexander disease in pediatric and adult patients on September 03, 2026. ^[1] Ionis Pharmaceuticals received FDA approval on September 3, 2026, for Zanvastro, the first disease-modifying therapy for Alexander disease. ^[2] Alexander disease is a rare, progressive neurological disorder caused by mutations in the gene that produces glial fibrillary acidic protein (GFAP), affecting less than 1 in a million people. ^[3] A pivotal trial showed that walking speed stayed stable in treated patients while the control group saw a 33% decline. ^[4] Researchers found hints that treating young children can improve motor function, not just stabilize it. ^[5]

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The U.S. Food and Drug Administration approved Zanvastro (zilganersen) injection for the treatment of Alexander disease in pediatric and adult patients on September 03, 2026. · FDA

Ionis Pharmaceuticals received FDA approval on September 3, 2026, for Zanvastro, the first disease-modifying therapy for Alexander disease. · STAT

Alexander disease is a rare, progressive neurological disorder caused by mutations in the gene that produces glial fibrillary acidic protein (GFAP), affecting less than 1 in a million people. · FDA

A pivotal trial showed that walking speed stayed stable in treated patients while the control group saw a 33% decline. · STAT

Researchers found hints that treating young children can improve motor function, not just stabilize it. · STAT

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