Exhibit 99.1 Business Updates Xywav (calcium, magnesium, potassium, and sodium oxybates) oral solution: Non-GAAP adjusted EPS is a non-GAAP financial measure. See 'Non-GAAP Financial Measures' below for more information. A reconciliation of GAAP reported EPS to non-GAAP adjusted EPS is included at the end of this press release. 1 1 Jazz Pharmaceuticals Announces First Quarter 2026 Financial Results – Xywav revenues grew 18% YoY with 425 net patient adds – ® – Epidiolex revenues grew 15% YoY– ® – Company rea ...