[Neurotropin suppression of the manifestations of the naloxone-provoked withdrawal syndrome in morphine-dependent rats].

Neurotropin was developed by Nippon Zoki Pharmaceutical Co. Ltd. It is produced by inoculating vaccine virus into rabbits and the effective substances are extracted from neuro-immuno inflamed cutaneous tissue. In the present study it was found that intraperitoneally administered neurotropin potently inhibits naloxone-precipitated withdrawal syndrome in morphine-dependent rats. Also we get the experimental evidence that neurotropin increases morphine action but has no positive-reinforcing properties. These data indicate the possibility of testing neurotropin as a medicine for treating opiate-abused patients.