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Health 1 SOURCE · UNCORROBORATED ≈US PATIENTS WITH SPINAL MUSCULAR ATROPHY ON EXISTING THERAPIES Sep 14, 2026

FDA approves Isembyld, first therapy for muscle loss in spinal muscular atrophy

The FDA approved Scholar Rock's drug Isembyld for US patients with spinal muscular atrophy aged 2 and older who are already on SMN2-targeting treatments. The drug is the first therapy to specifically target muscle loss in this condition. It is approved for use in combination with existing therapies, not as a standalone treatment, and its real-world effectiveness is not yet known.

Why it matters

This approval provides a new treatment option for a specific symptom of spinal muscular atrophy, a disease where existing therapies do not address muscle loss.

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