title: [Pharmacological studies of 4-ethoxy-2-methyl-5-morpholino-3(2H)-pyridazinone (M73101). (3). General pharmacological actions (author's transl)].
abstract: General pharmacological actions of M73101, a new non-steroidal analgesic anti-inflammatory drug were investigated in mice, rats, guinea pigs, rabbits, cats and dogs. Intravenous administration of M73101 produced a slight transient fall in blood pressure, an increase in heart rate and a respiratory stimulation, but no remarkable change in the electrocardiogram. The contraction induced by epinephrine in the isolated ear vessels of rabbits relaxed by M73101. In the isolated trachea of guinea pigs, M73101 relaxed the contraction induced by histamine. Furthermore, M73101 inhibited the bronchoconstriction by histamine but not by bradykinin in guinea pigs. These properties of M73101 on the tracheal smooth muscle were similar to those seen with aminopyrine but different from those seen with aspirin which inhibited only the contraction by bradykinin in vivo, suggesting that M73101 is a compound with properties similar to basic non-steroidal anti-inflammatory drugs. M73101 inhibited the intestinal propulsion in mice and also the gastrointestinal movement in rats and dogs. Moreover, M73101 showed a spasmolytic activity on the isolated ileum of guinea pigs, but such was not due to any specific antagonistic action on the chemical mediators. On the other hand, M73101 had no effect on the isolated uterus and vas deferens of rats. M73101, unlike aminopyrine and phenylbutazone, slightly increased urine volume and electrolytes excretion in rats, indicating that this compound probably does not produced edema. M73101 showed no significant pharmacological activities on the blood sugar level, blood coagulation, platelet aggregation, methemoglobin formation and local irritation.
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D001646:Bile / Q000378:metabolism; D001783:Blood Flow Velocity; D001794:Blood Pressure / Q000187:drug effects; D002415:Cats; D004285:Dogs; D004423:Ear / Q000098:blood supply; D004562:Electrocardiography; D005260:Female; D005769:Gastrointestinal Motility / Q000187:drug effects; D006168:Guinea Pigs; D006321:Heart / Q000187:drug effects; D006339:Heart Rate / Q000187:drug effects; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D009541:Nictitating Membrane / Q000187:drug effects; D011724:Pyridazines / Q000494:pharmacology*; D011817:Rabbits; D051381:Rats; D012119:Respiration / Q000187:drug effects; D014132:Trachea / Q000187:drug effects; D014566:Urogenital System / Q000187:drug effects
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D011724:Pyridazines; C018432:emorfazone