Viatris Completes Acquisition of Aculys Pharma Including Exclusive Rights to Pitolisant in Japan and to Spydia in Japan and Certain Other Markets in the Asia-Pacific Region

• Strengthens Viatris' Presence in Japan With the Addition of Two Innovative Assets Targeting Areas of Significant Unmet Medical Need
• Leverages Existing Infrastructure and Expertise in Central Nervous System Therapy Area
• Aligned with Strategy to Target Accretive Regional Business Development Opportunities.

15 October 2025 -- Pennsylvania, US -- Viatris Inc, a global healthcare company, today announced it has acquired Aculys Pharma, Inc., a clinical stage biopharmaceutical company focused on commercializing innovative treatments for neurological conditions. Viatris received rights to develop and commercialize pitolisant and Spydia, two assets in the Central Nervous System (CNS) therapy area, further expanding Viatris' portfolio of innovative products in Japan.

As part of the transaction, Viatris has acquired exclusive development and commercialization rights in Japan for pitolisant, a selective/inverse agonist of the histamine H3 receptor. Based on the strength of recent Phase 3 clinical trial results in Japanese patients and the positive benefit-risk profile established globally, Viatris is on track to file for marketing approval from the Ministry of Health, Labour and Welfare (MHLW) of Japan for the treatment of excessive daytime sleepiness (EDS) or cataplexy in adult patients with narcolepsy and for the treatment of excessive daytime sleepiness associated with obstructive sleep apnea syndrome (OSAS) by the end of 2025.
The transaction also includes exclusive rights in Japan and certain other markets in the Asia-Pacific region for Spydia Nasal Spray, which was approved in Japan in June 2025 for the treatment of status epilepticus.

"The acquisition of Aculys Pharma leverages our deep commercial infrastructure in Japan and longstanding expertise in CNS, positioning us to bring these innovative treatments to more patients in need," said Corinne Le Goff, Chief Commercial Officer, Viatris. "The addition of pitolisant and Spydia to our portfolio of innovative products is strategically aligned with our commitment to grow in areas where we can make the greatest impact and is a great example of our business development strategy designed to complement our core strengths in markets across the world."

This acquisition further expands Viatris' portfolio of innovative products in Japan which includes Effexor for the treatment of generalized anxiety disorder (GAD) which is under regulatory review, selatogrel in Acute MI, Nefecon in IgA nephropathy, and cenerimod in systemic lupus erythematosus (SLE), all of which have pivotal Phase 3 trials currently on going and Tyrvaya in dry eye disease for which a Phase 3 trial is anticipated to start in 2026.

About Viatris
Viatris Inc is a global healthcare company uniquely positioned to bridge the traditional divide between generics and brands, combining the best of both to more holistically address healthcare needs globally. With a mission to empower people worldwide to live healthier at every stage of life, we provide access at scale, currently supplying high-quality medicines to approximately 1 billion patients around the world annually and touching all of life's moments, from birth to the end of life, acute conditions to chronic diseases. With our exceptionally extensive and diverse portfolio of medicines, a one-of-a-kind global supply chain designed to reach more people when and where they need them, and the scientific expertise to address some of the world's most enduring health challenges, access takes on deep meaning at Viatris. We are headquartered in the U.S., with global centers in Pittsburgh, Shanghai and Hyderabad, India. Learn more at viatris.com.

About Aculys Pharma
Aculys Pharma is a clinical stage biopharmaceutical company that is pioneering ways to eliminate drug lag/drug loss in Japan and is working to resolve social issues related to neurological and psychiatry diseases. Its corporate name was created from the philosophy of serving as a "Catalyst to Access". Aiming to act as a bridge for innovative medical care in the field of neuropsychiatry, Aculys Pharma develops and commercializes novel pharmaceuticals introduced from the US and European countries and provides innovations for better medical care to patients, their families, healthcare professionals, and society. Visit: aculys.com/en.