Nektar says NKTR-181 shows 'significantly less abuse potential' than oxycodone
Nektar Therapeutics announced topline results from an oral Human Abuse Potential study of NKTR-181, an opioid analgesic that is the first full mu-opioid agonist molecule designed to provide potent pain relief without the high levels of euphoria that can lead to abuse and addiction with standard opioids. The NKTR-181 HAP study was designed to confirm and assess the relative oral abuse potential of NKTR-181 at its maximum analgesic or therapeutic dose of 400 mg and at a supratherapeutic dose of 3 times to 12 times greater than its analgesic dose range of 100 mg to 400 mg compared to common therapeutic doses of a Schedule II opioid, oxycodone. In the study, NKTR-181 400 mg had a significantly lower rating of peak liking compared to oxycodone 40 mg; NKTR-181 400 mg had a significantly lower rating of peak liking compared to oxycodone 60 mg; NKTR-181 600 mg had a significantly lower rating of peak liking compared to oxycodone 40 mg; NKTR-181 600 mg had a significantly lower rating of peak liking compared to oxycodone 60 mg; and NKTR-181 1200 mg had a significantly lower rating of peak drug liking compared to oxycodone 60 mg. This dose was not statistically different from oxycodone 40 mg, the company said. Ivan Gergel, Chief Medical Officer of Nektar, said, "It is clear from our new study results that NKTR-181 is highly differentiated in this respect from oxycodone, which is a choice drug of abuse. Further, and critically important in the context of this public health emergency, NKTR-181's less rewarding properties and strong analgesia are inherent to its novel molecular structure and independent of any abuse-deterrent formulation...We are committed to bringing this new pain treatment to patients and physicians as quickly as possible."