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Avadel Pharmaceuticals Strengthens Sleep Medicine Portfolio with Exclusive License of Valiloxybate

Avadel Pharmaceuticals (AVDL) | September 3, 2025

By Uma Mitchell

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Avadel Pharmaceuticals plc strengthens its sleep medicine portfolio through an exclusive license agreement with XWPharma Ltd to develop and commercialize valiloxybate, a GABA B receptor agonist, for sleep disorders treatment.

Valiloxybate offers a salt-free, artificial sweetener-free, once-at-bedtime oxybate formulation for narcolepsy and idiopathic hypersomnia.

The agreement includes an upfront payment of $20 million to XWPharma with potential milestone and royalty payments based on future net sales.

Innovative Treatment Addition

Valiloxybate provides an innovative once-at-bedtime, salt-free, and artificial sweetener-free formulation for narcolepsy and IH treatment.

Financial Aspects

XWPharma receives $20 million upfront with additional milestone payments and royalties based on sales milestones and net sales percentages.

Development Timeline

An initial PK study is set for Q4 2025, with a pivotal PK trial planned for the second half of 2026 to advance the valiloxybate formulation.

  • Avadel's acquisition of the exclusive license for valiloxybate expands its potential in the sleep disorder medication market.
  • The salt-free, once-at-bedtime formulation addresses specific patient needs, potentially increasing treatment adherence and outcomes.
  • The agreement's financial structure with milestone payments and royalties demonstrates confidence in valiloxybate's market potential.

Avadel's collaboration with XWPharma marks a significant step towards enhancing the treatment options for sleep disorders, showcasing innovative solutions for patients' needs.