• R J LoCasale, C J Datto, M K Margolis, J Tack, and K S Coyne.
• AstraZeneca Pharmaceuticals, LP, Wilmington, DE, USA.
• Int. J. Clin. Pract. 2015 Dec 1; 69 (12): 1448-56.

BackgroundThe impact of sufficient laxative use on opioid-induced constipation (OIC) is not known.AimTo understand the experience and symptom burden over time among chronic non-cancer pain patients with OIC who are sufficient laxative users.MethodsA prospective longitudinal study was conducted in United States, Canada, Germany and UK which included medical record abstraction, patient surveys and physician surveys. Patients on daily opioid therapy for ≥ 4 weeks for chronic non-cancer pain with OIC were recruited from physician offices and completed the survey at Baseline and Weeks 2, 4, 6, 8, 12, 16, 20 and 24. Sufficient laxative use was defined as at least one laxative remedy 4 or more times in the prior 2 weeks.ResultsOf the 489 patients who completed the Baseline survey and met OIC criteria, 234 (48%) were categorised as sufficient laxative users; 65% were female; 90% were white and 75 (32%) maintained sufficient laxative use for > 7 of the 8 follow-up periods. Patient Assessment of Constipation-Symptom (PAC-SYM) and Patient Assessment of Constipation-Quality of Life (PAC-QOL) scores indicated moderate symptom severity and impact. PAC-SYM and PAC-QOL scores remained relatively unchanged over time with a maximum score change of 0.5 points. Work productivity and activity impairment remained relatively constant. Mean per cent activity impairment because of constipation was 37% at Baseline and 34% at Week 24.ConclusionsThese findings demonstrate constipation persists despite sufficient laxative use with little improvement in symptoms, HRQL or activity impairment. This ongoing burden emphasises the need to identify more efficacious constipation therapies for this chronic pain patient population.© 2015 John Wiley & Sons Ltd.

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