Metkephamid, a systemically active analog of methionine enkephalin with potent opioid alpha-receptor activity.

@article{Frederickson1981MetkephamidAS,
  title={Metkephamid, a systemically active analog of methionine enkephalin with potent opioid alpha-receptor activity.},
  author={Robert C. A. Frederickson and E L Smithwick and Robert M Shuman and Kerry G. Bemis},
  journal={Science},
  year={1981},
  volume={211 4482},
  pages={603-5}
}
Metkephamid is an analog of methionine enkephalin that retains high affinity for the delta receptor and is a systemically active analgesic. Since it is at least 100 times more potent than morphine as an analgesic when placed directly into the lateral ventricles, and is 30 to 100 times more potent on the delta receptor and yet is roughly equipotent on the mu receptor in vitro, it is concluded that it probably produces analgesia by action on delta receptors as well as, or rather than, on mu… CONTINUE READING

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