title: Stability of acetazolamide in suspension compounded from tablets.
abstract: The stability of acetazolamide in an extemporaneous suspension compounded from tablets was studied. Acetazolamide 25-mg/mL suspension was prepared by levigating the comminuted 250-mg tablets with 70% sorbitol solution. The mixture was incorporated into a suspension vehicle containing magnesium aluminum silicate and carboxymethylcellulose sodium. Appropriate sweeteners, flavoring agents, preservatives, humectants, and pH adjusters were then added. The suspension was stored in amber glass bottles at 5, 22, 30, 40, and 50 degrees C. Samples were analyzed for the concentration of acetazolamide by stability-indicating high-performance liquid chromatography on days 3, 7, 11, 18, 24, 32, 42, 54, and 79. For batches stored at 5, 22, and 30 degrees C, the initial acetazolamide concentration was maintained during the entire 79 days of the study. However, the concentrations in the batches stored at 40 and 50 degrees C were below 90% of the initial value after 79 and 32 days, respectively. The Arrhenius plot was used to predict a shelf life of the suspension at room temperature of 371 days. Acetazolamide oral suspension 25 mg/mL was stable for at least 79 days at 5, 22, and 30 degrees C. The formulation should be maintained at pH 4-5 and stored in amber glass bottles.
authors.affiliation: Department of Pharmacy Practice, University of Toledo (UT), OH 43606.
authors.forename: K S
authors.initials: KS
authors.lastname: Alexander
authors.forename: R P
authors.initials: RP
authors.lastname: Haribhakti
authors.forename: G A
authors.initials: GA
authors.lastname: Parker
mesh_terms: D000086:Acetazolamide / Q000008:administration & dosage / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D004339:Drug Compounding / Q000379:methods; D004355:Drug Stability; D004356:Drug Storage; D013535:Suspensions; D013607:Tablets
chemical_list: D013535:Suspensions; D013607:Tablets; D000086:Acetazolamide