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Long-term treatment with plecanatide was safe and tolerable in patients with irritable bowel syndrome with constipation

Abstract Objective: This open-label, multi-center, fixed-dose study (NCT02706483) evaluated the long-term safety and tolerability of plecanatide for the treatment of adults with irritable bowel syndrome with constipation (IBS-C). Methods: Safety and tolerability of once-daily plecanatide 6 mg for up to 53 weeks was assessed in patients with IBS-C who either had been enrolled in one of the phase 3 studies or were study-naïve but met eligibility criteria of the double-blind studies. Safety was assessed by treatment-emergent adverse events (AEs). Patient-reported questionnaires assessed overall IBS symptoms, treatment satisfaction, and desire for treatment continuation. No dose adjustments or treatment interruptions were permitted during the study. Results: Of the 2272 patients enrolled, 1842 (81.1%) completed the study. AEs were experienced by 27.3%, and 4.3% discontinued due to an AE. Most AEs were mild or moderate (90.3%). The incidence of diarrhea, the most commonly reported AE, was low (6.7%), and declined in frequency over time. Diarrhea was the most common cause of AE-related withdrawals (2.7% of patients). At week 53 or end of treatment, 88.2% of patients reported “significant” or “moderate” relief, 72.4% were “very” or “quite” satisfied with treatment, and 76.6% were “very” or “quite” likely to continue treatment. Conclusions: Plecanatide 6 mg was safe and well tolerated in patients with IBS-C treated for up to 53 weeks, with an overall safety profile similar to the 12-week IBS-C studies. Patients reported high rates of relief and satisfaction with treatment, and interest in continuing therapy. Trial registration: ClinicalTrials.gov identifier: NCT02706483.