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Merck’s Cladribine Gains FDA Fast Track for Rare Neurological Disease

A potential game-changer for gMG patients is on the horizon. Merck’s oral therapy could redefine care—but will Phase 3 trials deliver the breakthrough investors need?

In this picture it looks like a pamphlet of a company with an image of a cup on it.
In this picture it looks like a pamphlet of a company with an image of a cup on it.

Merck’s Cladribine Gains FDA Fast Track for Rare Neurological Disease

Merck has secured a key regulatory boost for its drug cladribine, aimed at treating generalised myasthenia gravis (gMG). The U.S. Food and Drug Administration (FDA) granted the therapy 'Fast Track' status, speeding up its development. This move comes as the company also pushes into AI-driven research for Parkinson’s disease.

Analysts see the gMG market as an area of high unmet need, offering strong pricing potential for Merck’s pipeline.

The FDA’s 'Fast Track' designation accelerates cladribine’s path toward becoming the first oral short-term treatment for gMG. If approved, it would fill a gap in a market where effective therapies remain limited. The decision follows Merck’s broader strategy to strengthen its neurology and immunology portfolio.

Meanwhile, the company has partnered with Valo Health to develop AI-powered treatments for Parkinson’s disease. The deal could see Valo earn up to $3 billion in milestone payments, depending on progress. Amy Kao, Merck’s global head of neurology and immunology research, is leading the AI-driven approach.

Investors have watched Merck’s stock decline by roughly 16.6% since January. The FDA designation and AI initiatives may help reverse this trend, but success hinges on upcoming results. Positive interim data from the Phase 3 'MyClad' trial in the coming weeks will be critical for momentum.

Elsewhere, Merck’s Life Science division still faces post-pandemic adjustments, while its Healthcare segment must deliver stability. The company is balancing innovation with market challenges to regain investor confidence.

The FDA’s 'Fast Track' decision for cladribine marks a step forward in gMG treatment. If the Phase 3 trial yields strong results, Merck could secure a valuable new therapy. The AI partnership and regulatory progress may also help offset recent stock declines and pipeline concerns.

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