| abstract |
Pyridazine derivatives of the formula I DOLLAR F1 in which R.sup.1, R.sup.2, R.sup.3, X and B have the meanings given in claim 1, act as phosphodiesterase IV inhibitors and can be used to treat osteoporosis, tumors, cachexia , Atherosclerosis, rheumatoid arthritis, multiple sclerosis, diabetes mellitus, inflammatory processes, allergies, asthma, autoimmune diseases, myocardial diseases and AIDS. |