title: Stability of the powdered dosage form prepared by unsealing the capsules: water vapor sorption and discoloration of the powdery contents of clorazepate dipotassium capsules.
abstract: The hygroscopicity of the contents of clorazepate dipotassium (Mendon) capsules (CM) was investigated by storage at various relative humidities (RHs). The CM adsorbed water vapor significantly at more than 75% RH. At the same time, a marked discoloration of CM from white to yellow was also observed during storage. On the basis of differential scanning calorimetry (DSC) and Fourier transform (FT) Raman spectroscopy, the discoloration seemed to be due to the change in clorazepate dipotassium to nordiazepam and other substances. It was found that, when opening of the Mendon capsule is necessary to prepare the powdered dosage form, the CM should be stored below 60% RH to avoid the adsorption of water vapor and discoloration.
authors.affiliation: Department of Pharmacy, Yamanashi Medical University, Japan. thana@res.yamanashi-med.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Hanawa
authors.forename: T
authors.initials: T
authors.lastname: Ohta
authors.forename: F
authors.initials: F
authors.lastname: Kimura
authors.forename: T
authors.initials: T
authors.lastname: Tsuchiya
authors.forename: R
authors.initials: R
authors.lastname: Ikoma
authors.forename: T
authors.initials: T
authors.lastname: Uchida
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: S
authors.initials: S
authors.lastname: Nakajima
mesh_terms: D014151:Anti-Anxiety Agents / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D002214:Capsules; D003009:Clorazepate Dipotassium / Q000737:chemistry*; D003116:Color; D004304:Dosage Forms; D004355:Drug Stability; D004356:Drug Storage; D005583:Fourier Analysis; D017155:Wettability
chemical_list: D014151:Anti-Anxiety Agents; D002214:Capsules; D004304:Dosage Forms; D003009:Clorazepate Dipotassium