Background: Despite the abundance of study evidence for its efficacy and tolerability for the treatment of constipation in other countries, polyethylene glycol 3350 plus electrolytes (PEG3350+E) was not available in Japan until recently. The purpose of this study was to establish the efficacy and safety of PEG3350+E for the treatment of functional constipation in children in Japan. Methods: Japanese children aged 2-14 years with a mean spontaneous bowel movement (SBM) frequency of 2 times/week or less for at least 2 months prior to informed consent were enrolled into the study. After a 2-week screening period, treatment with PEG3350+E was initiated on the day of enrollment and continued for 12 weeks. Change in SBM frequency from screening period week 2 (baseline) to treatment period week 2 was set as the primary endpoint. Secondary endpoints and adverse events were also examined. Results: Thirty-nine patients were enrolled and completed the 12-week study period. The SBM frequency (mean AE SD) at baseline and treatment period week 2 was 1.00 AE 0.89 and 6.54 AE 4.38, respectively. The change in SBM frequency was 5.54 AE 4.55 (one-sample t test, P < 0.0001) and remained stable through week 12. Stool consistency was also improved over the entire treatment period. Three mild adverse drug reactions were reported: decreased appetite, abdominal pain, and diarrhea (each in 1 of 39 [2.6%] patients). Conclusion: PEG3350+E can be considered as a new treatment option for chronic constipation in children in Japan. Clinical trial registration number: Japic CTI-163167.
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