RecruitingPhase 3Drug trialA 26-Wk Study to Assess Safety & Efficacy of Tenapanor for T/t of Chronic Idiopathic Constipation in AdultsThis is a 26-week, multi-center, randomized, double-blind, placebo-controlled study with a 4-week treatment-free Safety Follow-up period to assess the safety and efficacy of tenapanor (5 mg, 25mg, and 50 mg) in adult patients with Chronic Idiopathic Constipation (CIC) when administered twice daily for 26 consecutive weeks.