5-Hydroxylansoprazole (AG1908) is an active metabolite of Lansoprazole in plasma. Lansoprazole is metabolized by CYP2C19 forming 5-Hydroxylansoprazole. Lansoprazole is a gastric proton-pump inhibitor and is effective in the treatment of various peptic diseases[1][2].
[1]. Xu HR, et al. The effect of CYP2C19 activity on pharmacokinetics of lansoprazole and its active metabolites in healthy subjects. Pharm Biol. 2010 Aug;48(8):947-52. doi: 10.3109/13880200903300220. [2]. KatarÍna KostolanskÁ, et al. Determination of lansoprazole, 5-hydroxylansoprazole, and lansoprazole sulfone in human plasma for CYP2C19 and CYP3A4 phenotyping. Chemical Papers. volume 73, pages2955-2963(2019).