This invention relates to a method for selectively enhancing the analgesic potency of a bimodally-acting opioid agonist such as morphine and simultaneously attenuating anti-analgesia, hyperalgesia, hyperexcitability, physical dependence and/or tolerance effects associated with the administration of the...http://www.google.com.au/patents/US6096756?utm_source=gb-gplus-sharePatent US6096756 - Method of simultaneously enhancing analgesic potency and attenuating dependence liability caused by morphine and other bimodally-acting opioid agonists
