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Pharmacological properties of midaglizole (DG-5128, CAS 66529-17-7) on smooth muscle, gastrointestinal and miscellaneous systems were investigated in comparison with those of tolbutamide. 1. Isolated smooth muscle: Midaglizole inhibited the contractile responses of the ileum to nicotine, acetylcholine, serotonin and BaCl2, and especially the response to histamine (guinea pig). Tolbutamide also reduced the contractions. On spontaneous motility of the uterus (estrus, diestrus, pregnant), midaglizole produced an increase in tonus and frequency, and decrease in contractile amplitude (rat). Tolbutamide reduced the motility of the uterus. The contractile response of the vas deferens to norepinephrine was potentiated after midaglizole and tolbutamide (guinea pig). Midaglizole inhibited the contractile response of the trachea to histamine, whereas it had little or no effect on the response to acetylcholine (guinea pig). Tolbutamide reduced the responses to both spasmogens. 2. Gastrointestinal system: Midaglizole induced an increase in gastrointestinal transit (mouse) and potentiated the gastrointestinal motility (dog). Tolbutamide was without any effect on these parameters. Gastric emptying rate, gastric secretion and gastric mucosa were not influenced after midaglizole (rat). Tolbutamide decreased gastric secretion and produced injury of gastric mucosa. 3. Urine volume: Midaglizole and tolbutamide showed a diuretic activity (rat). 4. Anti-inflammatory activity: Midaglizole and tolbutamide inhibited carrageenin-induced paw edema (rat).
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