Koopmans, G., Simpson, K., De Andres, J., Lux, E. A., Wagemans, M., & Van Megen, Y. (2014). Fixed ratio (2:1) prolonged-release oxycodone/naloxone combination improves bowel function in patients with moderate-to-severe pain and opioid-induced constipation refractory to at least two classes of laxatives. Current Medical Research and Opinion, 30, 2389–2396.
To determine the effect of a combination of oxycodone and naloxone prolonged release tablets (OXN PR) on opioid-induced constipation and pain in patients with moderate to severe cancer- or noncancer-related pain
Patients had received OXN PR in prior double-blinded, multicenter, randomized studies. In one previous study (also a pooled analysis of two Phase III studies), patients with noncancer-related pain received 12 weeks of OXN PR or oxycodone prolonged release (Oxy PR) at the dose equivalent of 20–50 mg per day or 60–120 mg per day. After a 7–28-day period, patients were titrated to an effective analgesic dose of Oxy PR. In a previous Phase II study, patients with moderate to severe cancer-related pain were screened for 3–10 days and then switched to OXN PR or Oxy PR for four weeks (20–120 mg per day). In all prior studies, bisacodyl at 10 mg per day could be taken orally as a rescue laxative 72 hours after a previous bowel movement or when the patient experienced discomfort for a maximum of five doses in seven consecutive days. In all previous studies, data were collected at screening, at the start of the intervention period, and at the end of the intervention period. Laxative use was documented throughout the intervention period in all studies.
Pooled analysis
The high BFI score at the time of screening indicated that both groups of patients experienced constipation and that patients with cancer-related pain experienced more symptoms. OXN PR clinically and statistically improved constipation in patients with chronic cancer- and noncancer-related pain. Laxative use decreased during the intervention period, and more patients fell within the range of normal bowel habits as the intervention progressed. Pain scores did not change during the intervention period although there was a nonsignificant trend of pain improvement in patients with cancer-related pain.
OXN PR may be a viable pharmacologic intervention to achieve pain control in patients with cancer-related pain while minimizing the symptoms of opioid-induced constipation. OXN PR reduced laxative use and increased the number of patients who reported normal bowel function. OXN PR did not change pain scores.