Clobenetine is benzomorphan derivative developed by Boehringer-Ingelheim. Clobenetine acts as a sodium channel blocker and displaces radioligand from neurotoxin receptor site 2 of the Na(+) channel in rat brain synaptosomes with IC50 of 49 nM. The IC50 value for the inactivated Na(+) channels was much lower than for Na(+) channels in the resting state. In animal models, clobenetine reduced lesion size in mice and rats when administered 5 min after permanent focal cerebral ischemia at doses that did not impair motor coordination. Clobenetine produced significant analgesic and anti-hyperalgesic effects in the rat model of arthritis, induced by complete Freund's adjuvant. In the early 2000s, the compound was investigated in phase II clinical trial for the treatment of thromboembolic stroke, but no results were reported.