- Background: LF 16-0687 Ms previously was reported to improve Neurological Severity Score (NSS) and decrease cerebral edema and prostaglandin E 2 (PGE 2 ) release after closed head trauma (CHT) in rats. Here, we examined whether these beneficial effects of LF 16-0687 Ms are altered when CHT is accompanied by acute ethanol administration. Methods: Six groups of rats (n = 8 per group) were examined during combination of the following experimental conditions: CHT versus sham operation, LF 16-0687 Ms 3 mg/kg subcutaneously versus saline, and ethanol 2 g/kg versus saline. Results: After CHT, brain water content decreased and NSS improved with ethanol + LF 16-0687 Ms as compared with values after saline or ethanol. PGE 2 release decreased with ethanol (147 ± 59 pg/mg tissue) but not with ethanol + LF 16-0687 Ms (286 ± 194 pg/mg tissue). Conclusion: Ethanol does not affect the improvement of NSS and the decrease of cerebral edema seen with LF 16-0687 Ms after CHT, but does reverse the ability of LF 16-0687 Ms to minimize the increase of PGE 2 release. In intoxicated patients, bradykinin antagonist therapy may improve post-CHT outcome without altering PGE 2 release.