ARTICLE Stability of Ciprofloxacin in Polyvinylchloride

Background: Ciprofloxacin is a fluoroquinolone antibiotic used to treat infections caused by both gram-positive and gram-negative organisms. Objective: To determine the physical and chemical stability of ciprofloxacin diluted in 5 % dextrose in water (D5W) or 0.9 % sodium chloride (normal saline [NS]) and stored in polyvinylchloride (PVC) minibags at various temperatures. Methods: Solutions of ciprofloxacin (1 and 2 mg/mL) were prepared by diluting a commercially available concentrate (10 mg/mL) with either D5W or NS. The prepared solutions were then packaged in PVC mini-bags. Three minibags of each concentration–diluent combination were stored at 2°C to 8°C with protection from light, at 21°C to 24°C with exposure to light, and at 29°C to 31°C with protection from light. Samples were collected from each minibag on days 0, 7, 14, and 30 and then analyzed. Colour, clarity, and pH were monitored when the samples were collected. On each day of analysis, the samples were accurately dilut-ed before duplicate analysis with a stability-indicating high-performance liquid chromatography assay. A solution was considered stable if the con-centration remained above 90 % of the initial values. Results: There were no changes in the physical characteristics of any of the solutions. At both concentrations (1 and 2 mg/mL), the ciprofloxacin solutions prepared in D5W remained above 93.9 % of the initial concen-tration over the 30-day study period under all 3 storage conditions. Similarly, at both concentrations, solutions diluted in NS remained above 95.9 % of the initial concentration over the 30-day study period under all 3 storage conditions. Conclusions:Ciprofloxacin prepared in either D5W or NS and stored in PVC minibags was stable for 30 days under 3 separate storage conditions: 2°C to 8°C with protection from light, 21°C to 24°C with exposure to light, and 29°C to 31°C with protection from light