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Tegoprazan (CJ‐12420) is a potassium‐competitive acid blocker (P‐CAB) with therapeutic potential for gastro‐oesophageal reflux disease (GERD) by reversibly suppressing gastric H⁺/K⁺‐ATPase.

To investigate the safety, tolerability, pharmacokinetics and pharmacodynamics of tegoprazan

A phase I, randomised, double‐blind and placebo‐controlled clinical trial was conducted in 56 healthy male subjects without Helicobacter pylori infection. In the single ascending dose study, 50, 100, 200 and 400 mg tegoprazan were administered to 32 subjects. In the multiple ascending dose study, 100 and 200 mg tegoprazan were administered every 24 hours to each of the eight subjects for 7 days. In the comparative pharmacodynamics study, 40 mg esomeprazole was administered to eight subjects every 24 hours for 7 days. The assessment included safety, tolerability, pharmacodynamics …