The US Food and Drug Administration (FDA) has accepted AstraZeneca’s new drug application (NDA) for naloxegol, an investigational peripherally acting mu-opioid receptor antagonist (PAMORA) for the treatment of opioid-induced constipation (OIC).

Naloxegol has been studied in OIC in adult patients with chronic non-cancer pain, the most common side-effect caused by chronic administration of prescription opioid pain medicines.

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Submission of the NDA was based on data secured from the core Phase III KODIAC programme, which included four clinical trials designed to evaluate the safety and efficacy of naloxegol for the treatment of OIC.

“Submission of the NDA was based on data secured from the core Phase III KODIAC programme, which included four clinical trials designed to evaluate the safety and efficacy of naloxegol for the treatment of OIC.”

In the 12-week, multicentre, randomised, double blind, placebo-controlled KODIAC-04 and KODIAC-05 trials, patients were assessed with 12.5mg and 25mg doses of naloxegol once-daily.

KODIAC-07 is a 12-week safety extension of KODIAC-04, while KODIAC-08 was an open-label controlled, randomised, 52-week, long-term safety trial.

The drug is part of a worldwide licence agreement announced in 2009 between AstraZeneca and Nektar Therapeutics, which will involve AstraZeneca making a $70m milestone payment to Nektar within five business days of acceptance of the NDA by the US FDA.

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Naloxegol was developed using Nektar’s oral small molecule polymer conjugate technology, and is claimed to have the potential to be the first once-daily oral PAMORA for patients with OIC in the US.

The drug is a once-daily tablet designed to block the binding of opioids to the opioid receptors in the gastrointestinal (GI) tract without impacting the opioid receptors in the brain.