• OX640 is an intranasal rescue medication for the treatment of severe allergic reactions (incl. anaphylaxis) with powder-based epinephrine.
• OX640 is based on Orexo´s proprietary drug delivery platform, AmorphOX^®, and has demonstrated positive data in a phase 1 clinical study in healthy volunteers.
• The new study will investigate the performance of OX640 in participants with allergic rhinitis.

Orexo AB (publ.), announces the first participants have been dosed with OX640, an intranasal rescue medication for severe allergic reactions (incl. anaphylaxis) with powder-based epinephrine, in a new study in subjects with allergic rhinitis (hay fever). The study will be completed during 2024 with results available early in 2025.

Following the positive results from the phase 1 clinical study, OX640-001, where OX640 showed absorption of epinephrine and effects on blood pressure and heart rate equivalent to an epinephrine intramuscular auto-injector, Orexo now advances the development of OX640. In the new study, OX640-002, the epinephrine absorption from OX640 will be investigated in participants with and without allergic symptoms in the nose. As patients may experience allergic symptoms in the nose during anaphylaxis, it is critical to understand the absorption of epinephrine from Orexo's unique powder formulation under these conditions.

The study is a cross-over study in 30 participants with allergic rhinitis and involves four treatment periods. In one of the periods, a small dose of an allergen will be sprayed into the nose of the participants to trigger an allergic reaction before being treated with OX640. This will be compared with absorption of epinephrine from OX640 without the allergen, and a commercial intramuscular epinephrine product. The fourth period will be used to document dose proportionality of OX640. In addition to the absorption of epinephrine, effects on blood pressure and heart rate will be measured as relevant parameters to understand the effect of OX640 in case of an anaphylaxis.

Robert Rönn, SVP and Head of R&D, said: "Anaphylaxis is a serious and life-threatening condition, making it essential to ensure that OX640 remains effective even in the presence of nasal allergic symptoms. The study addresses key development and regulatory requirements and is an important step in advancing the project towards regulatory approval. The performance of OX640 under allergic rhinitis conditions has also been requested in many discussions with health care providers and with potential partners."

The study is expected to cost SEK 11 million. Most of these costs will be recognized in 2024 and are included in the communicated financial outlook for 2024.