Background: Drug-induced constipation (DIC) is a well-known comorbidity of cancer pain, however, data on its prevalence in nonmalignant pain (NMP) and its biopsychosocial effects are few.
Objective: To assess the prevalence and impact of DIC in patients with NMP.
Methods: Exploratory noninterventional, retrospective, cross-sectional analysis of depersonalized routine data of the German Pain e-Registry on 150,488 NMP patients (EUPAS identifier: 42286).
Results: DIC affects 33.5% of NMP patients. The most prevalent risk factors were the use of strong opioid analgesics and analgesic polymedication. Patients with DIC presented with significantly worse biopsychosocial scores as well as significantly higher percentages of individuals with severe deterioration of pain, daily life activities, physical and mental quality of life, mood, and overall wellbeing. Among patients with DIC, those who reported constipation as a clinical symptom and who documented bowel-function index (BFI) scores above the reference range were significantly more affected compared to those who either reported only constipation as an adverse event or elevated BFI scores. 55.9% of patients with DIC reported the use of laxatives, mostly over-the-counter preparations (43.6%), whereas prescription laxatives were taken by only 29.3%.
Conclusions: DIC is a frequent comorbidity of pain management and affects around one-third of patients with NMP. It interferes significantly with pain-related biopsychosocial effects and has to be addressed specifically to improve the overall burden in affected patients. However, the use of laxatives was significantly less frequent than recommended indicating significant room for improvement.
Keywords: Drug-induced constipation; German Pain e-Registry; adverse pain medication effects; chronic nonmalignant pain; laxative use.