41. It is a high-antagonist of the ?-opioid receptor. 42. The four main opioid receptor types ( primitive jawless fishes. 43. Other drugs that are sometimes helpful include sedatives, opioid painkillers and anticonvulsants. 44. Another candidate for the psychoactive drug is an opioid derived from the poppy. 45. Opioid antagonist such as naloxone can also be administered concurrent with oxygen supplementation.46. The term " opioid " originated in the 1950s. 47. Recent investigations discovered opioid receptors on peripheral sensory neurons. 48. Inflammatory pain is also blunted by endogenous opioid peptides activating peripheral opioid receptors. 49. Inflammatory pain is also blunted by endogenous opioid peptides activating peripheral opioid receptors. 50. This side effect can be severe enough to warrant discontinuation of opioid treatment.
