zhejiang yongtai pharmaceutical co., ltd - Medication Listings

The active ingredient in Gabapentin Capsules, USP is gabapentin,which has the chemical name 1-(aminomethyl)cyclohexaneacetic acid. The molecular formula of gabapentin is C 9 H 17 NO 2 and the molecular weight is 171.24. The structural formula of gabapentin is: Gabapentin is a white to off-white crystalline solid with a pK a1 of 3.7 and a pK a2 of 10.7. It is freely soluble in water and both basic and acidic aqueous solutions. The log of the partition coefficient (n-octanol/0.05M phosphate buffer) at pH 7.4 is -1.25. Each gabapentin capsule, USP contains 100 mg, 300 mg, or 400 mg of gabapentin and the following inactive ingredients: mannitol, pregelatinized starch, talc, gelatin, titanium dioxide, yellow iron oxide (300 mg only), FD&C Blue No. 1 (400 mg only), FD&C Red No. 3 (400 mg only) and imprinting ink which contains black iron oxide, potassium hydroxide, propylene glycol and shellac. Chemical Structure

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 trihydrate, 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 3 H 2 O with molecular weight of 767.2 as a trihydrate and 713.1 on an anhydrous basis. The structural formula is: Figure 1 The magnesium salt is a white to slightly colored crystalline powder. It contains 3 moles of water of solvation and is slightly soluble in water. 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 is supplied in delayed-release capsules. Each esomeprazole magnesium delayed-release capsule, USP contains 20 mg of esomeprazole (equivalent to 22.3 mg esomeprazole magnesium trihydrate) or 40 mg of esomeprazole (equivalent to 44.5 mg esomeprazole magnesium trihydrate) in the form of enteric-coated pellets with the following inactive ingredients: sugar spheres, hypromellose, talc, magnesium stearate, methacrylic acid and ethyl acrylate copolymer dispersion, triethyl citrate, mono- and di-glycerides, polysorbate 80. The capsule shells have the following inactive ingredients: gelatin, FD&C Blue #1, FD&C Red #3, titanium dioxide, shellac, isopropyl alcohol, n-butyl alcohol, propylene glycol. Structural Formula

Rosuvastatin is a 3-hydroxy-3-methylglutaryl coenzyme A (HMG CoA)-reductase inhibitor. The chemical name for rosuvastatin calcium is bis[(E)-7-[4-(4-fluorophenyl)-6-isopropyl-2-[methyl(methylsulfonyl)amino] pyrimidin-5-yl](3R,5S)-3,5-dihydroxyhept-6-enoic acid] calcium salt with the following structural formula: The empirical formula for rosuvastatin calcium is (C 22 H 27 FN 3 O 6 S) 2 Ca and the molecular weight is 1,001.14. Rosuvastatin calcium is a white amorphous powder that is sparingly soluble in water and methanol, and slightly soluble in ethanol. Rosuvastatin calcium is a hydrophilic compound with a partition coefficient (octanol/water) of 0.13 at pH of 7.0. Rosuvastatin tablets for oral use contain rosuvastatin 5 mg, 10 mg, 20 mg, or 40 mg (equivalent to 5.2 mg, 10.4 mg, 20.8 mg, and 41.6 mg rosuvastatin calcium) and the following inactive ingredients: microcrystalline cellulose NF, lactose monohydrate NF, anhydrous dibasic calcium phosphate USP, crospovidone NF, magnesium stearate NF, hypromellose USP, titanium dioxide USP, triacetin USP, yellow ferric oxide NF (rosuvastatin tablets, 5 mg and 20 mg), red ferric oxide NF (rosuvastatin tablets, 10 mg and 40 mg). structural

Doxycycline is an antibacterial drug synthetically derived from oxytetracycline, and is available as Doxycycline Hyclate (doxycycline hydrochloride hemiethanolate hemihydrate) for oral administration. The structural formula of doxycycline hyclate is with a molecular formula of C 22 H 24 N 2 O 8 •HCl) 2 •C 2 H 6 O•H 2 Oand a molecular weight of 1025.88. The chemical designation for doxycycline hyclate is 4-(Dimethylamino)-1,4,4a, 5,5a,6,11,12a-octahydro - 3,5,10, 12,12apentahydroxy-6-methyl-1,11-dioxo-2- naphthacen ecarboxamide monohydrochloride, compound with ethyl alcohol (2:1), monohydrate. Doxycycline hyclate is a yellowish crystalline powder. Doxycycline hyclate is soluble in water. Doxycycline has a high degree of lipoid solubility and a low affinity for calcium binding. It is highly stable in normal human serum. Doxycycline will not degrade into an epianhydro form. Inert ingredients in the capsule formulations are: hard gelatin capsules (which contain FD&C Blue 1, gelatin, purified water and titanium dioxide ); microcrystalline cellulose ; magnesium stearate. Chemical Structure