Information GLPG1837 GLPG1837 (ABBV-974) is a novel CFTR potentiator with an EC50 value of 3 nM for F508del, showing enhanced efficacy on CFTR mutants harboring class III mutations compared to Ivacaftor. Targets CFTR(F508del) ; CFTR(G551D) 3 nM(EC50); 339 nM(EC50) In vitro GLPG1837 has an attractive in vitro ADME profile, showing low Clint,unb in both microsomal and hepatocytes stability assays, good permeability, and no off-target inhibition of CYPs and the hERG channel. In vivo The pharmacokinetic profile of GLPG1837 is attractive, showing a low Cl,unb and good F% in both rat and dog. The CL (L/h/kg) of GLPG1837 after intravenous injection of 1 mg/kg dose are 1.92 and 0.32 in rats and dogs, respectively. T 1/2 is 1.84 h in rats while 3 h in dogs. After 5 mg/kg p.o, the oral availability of GLPG1837 in rat is 67%. In dogs, F%>100.