SPL Set ID: 2d21ed0b-a089-46f4-9ebb-f24f9f3af61d

The active ingredient in the proton pump inhibitor esomeprazole magnesium delayed-release capsules for oral administration is bis(5-methoxy-2-[(S)-[(4-methoxy-3,5-dimethyl-2-pyridinyl)methyl]sulfinyl]-1 H -benzimidazole-1-yl) magnesium trihydrate. 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 3 H 2 O with molecular weight of 767.17 as a trihydrate and 713.1 on an anhydrous basis. The structural formula is: Figure 1 The magnesium salt is a white or slightly colored powder. It contains 3 moles of water of solvation and is slightly soluble in methanol, insoluble in water and in n-Heptane. 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. Esomeprazole magnesium delayed-release capsules are supplied in delayed-release capsules. Each delayed-release capsule contains 20 mg, or 40 mg of esomeprazole (present as 22.25 mg, or 44.50 mg esomeprazole magnesium trihydrate) in the form of enteric-coated granules with the following inactive ingredients: hydroxypropyl cellulose, hypromellose 2910, magnesium stearate, methacrylic acid and ethyl acrylate copolymer dispersion, mono-and di-glycerides, polysorbate 80, sugar spheres, talc and triethyl citrate. The capsule shells have the following inactive ingredients: gelatin, sodium lauryl sulfate and titanium dioxide. The imprinting ink also contains ferric oxide black, shellac, strong ammonium solution, potassium hydroxide and propylene glycol. Image