Reduction of aspirin-induced ulcers by a new imidazoline anti-inflammatory agent.

We have previously described the anti-inflammatory and low ulcerogenic actions of the formamidine pesticide, chlordimeform (CDM). In this study, the related basic compound, CDMI [2-(2-methyl-4-chlorophenylamino)-2-imidazoline], also demonstrated potent anti-edema (vs. carrageenin) and low ulcerogenic activity. A nonulcerogenic i.p. dose of CDMI reduced aspirin (ASA)-induced ulcers [lesion index (L.I.): 25.8 for ASA alond vs. 5.3 for ASA + i.p. CDMI]; prevented stress-induced ulcers in mice; and decreased acid secretion (by 90% in the Shay rat preparation). A mildly ulcerogenic oral dose (0.6 mmol/kg) of CDMI prevented stress ulcers, but did not reduce ASA ulcers. A nonulcerogenic oral dose (0.15 mmol/kg) of CDMI did reduce ASA ulcers (L.I.: 24.5 for ASA alone vs. 14.7 for ASA + oral CDMI). Thus, CDMI is a unique anti-inflammatory agent with additional anti-secretory and ulcer-reducing actions.