| 41. | "' Cogazocine "'( INN ) is an opioid analgesic of the benzomorphan family which was never marketed.
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| 42. | "' Butinazocine "'( INN ) is an opioid analgesic of the benzomorphan family which was never marketed.
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| 43. | "' Levomethorphan "'( BAN ) is an opioid analgesic of the morphinan family that has never been marketed.
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| 44. | Toll-like receptor 4 has been shown to be important for the long-term side-effects of opioid analgesic drugs.
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| 45. | Phenadoxone is generally considered to be a strong opioid analgesic and is regulated in much the same way as morphine where it is used.
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| 46. | "' Lofentanil "'is one of the most potent opioid analgesics known and is an affinity from increasing much further.
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| 47. | "' SNC-80 "'is an opioid analgesic drug that selectively activates heteromers and is used in scientific research.
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| 48. | "' U-77891 "'is an opioid analgesic drug that was first synthesized in 1983 by the Upjohn company.
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| 49. | "' Diampromide "'is an opioid analgesic from the ampromide family of drugs, related to other drugs such as propiram.
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| 50. | "' Furethidine "'is a 4-phenylpiperidine derivative that is related to the opioid analgesic drug pethidine ( meperidine ).
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