SPL Set ID: 925cee78-83af-480f-838d-8ba97ac6b1e3

The active ingredient in esomeprazole magnesium delayed-release capsules, USP for oral administration is bis (5-methoxy-2-[(S)-[(4-methoxy-3,5-dimethyl-2-pyridinyl)methyl]sulfinyl]-1 H -benzimidazole-1-yl) magnesium dihydrate, a PPI. Esomeprazole is the S-isomer of omeprazole, which is a mixture of the S- and R- isomers. (Initial U.S. approval of esomeprazole magnesium: 2001). Its molecular formula is (C 17 H 18 N 3 O 3 S) 2 Mg x 2 H 2 O with molecular weight of 749.15 as a dihydrate and 713.15 on an anhydrous basis. The structural formula is: Figure 1 The magnesium salt is a white to creamish colored hygroscopic powder. It contains 2 moles of water of solvation and is slightly soluble in water and methanol, practically in soluble in heptane and soluble in N, N-dimethyl formamide. The stability of esomeprazole magnesium is a function of pH; it rapidly degrades in acidic media, but it has acceptable stability under alkaline conditions. At pH 6.8 (buffer), the half-life of the magnesium salt is about 19 hours at 25°C and about 8 hours at 37°C. Each capsule of esomeprazole magnesium delayed-release capsule, USP contains 20 mg, or 40 mg of esomeprazole (present as 21.8 mg and 43.5 mg esomeprazole magnesium dihydrate, respectively), in the form of the enteric-coated pellets. The enteric-coated pellets are composed of following inactive ingredients: FD&C blue 1, hydroxypropyl cellulose, gelatin, magnesium oxide, magnesium stearate, mannitol, methacrylic acid copolymer dispersion, mono- and di-glycerides, povidone, polysorbate 80, sodium lauryl sulfate, starch (source: maize), sucrose, talc, titanium dioxide and triethyl citrate. Additionally, each 20 mg capsule shell contains: FD&C red 3 and each 40 mg capsule shell contains: D&C red 28. The capsule shell is printed with black pharmaceutical ink which contains following ingredients: black iron oxide, potassium hydroxide, propylene glycol and shellac.