9-(2-morpholinoethyl)-2-(4-fluorophenyl)imidazo(1-2-alpha)benzimidazole and Pain

We have studied the analgesic activity of a morpholinoethylimidazobenzimidazole derivative (RU-1205) in comparison to butorphanol. It is established that the test compound exhibits a pronounced analgesic activity, which exceeded that ofbutorphanol six times in the hot-plate test and was comparable to the reference drug effect in the tail-flick and acetic acid-induced writhing tests. It is established that the analgesic action of RU-1205 is based on the kappa-opioidergic mechanism.

Topics: Analgesics; Animals; Animals, Outbred Strains; Benzimidazoles; Butorphanol; Male; Mice; Morpholines; Naloxone; Naltrexone; Narcotic Antagonists; Nociception; Pain; Pain Measurement; Rats; Receptors, Opioid, kappa