The present invention relates to novel aza-thia-benzoazulene derivatives of formula I as defined in the claims, their preparation, the use of these novel compounds for the preparation of pharmaceutical compositions, the use of these novel compounds and compositions for managing arthritis and arthritis-related conditions as well as in the treatment of pain in animals and humans. More particularly, the present invention relates to pharmaceutical, preferably veterinary compositions and methods for reducing inflammation and pain associated with acute inflammation of body parts, particularly joints, due to injury or due to arthritic conditions or other disease conditions.