Efficacy of Oxycodone/Naloxone(OXN), Versus Oxycodone (OXY), for the Reduction of Intensity of Opioid-induced Constipation in Pain Patients

The primary objective of this trial is to study the efficacy of oxycodone/naloxone prolonged release tablets (OXN PR), compared to oxycodone prolonged release tablets (Oxy PR), for the reduction of the intensity of opioid-induced constipation symptoms in patients treated for cancer or non-cancer pain.