Background: The chemical stability of coadministered ondansetron (OND) and haloperidol (HAL) in parenteral admixtures has not been described yet.
Objective: The aim of the present work is to study the chemical stability and the compatibility of OND and HAL admixtures.
Methods: Normal saline solution and dextrose were used to prepare the admixture solutions of the drugs; the materials of the containers were the original plastic bags of the diluents and the stability was studied at 20°C. Compatibility was studied by visual inspection of no colour change and turbidity or precipitation appearance. The concentration of the drugs was studied by ultraviolet detection high-performance liquid chromatography. The method was validated following the Food and Drug Administration and European Medicines Agency guidelines, and the assay enables the measurement of both drugs with a linear calibration curve (r=0.999) over the concentration range 10-100 µg/mL, with acceptable values of linearity, precision and accuracy. Darunavir was used as internal standard.
Results: Most of the admixtures have an adequate concentration until 24 hours(less than 10% of loss). 25% of the samples show a higher loss at 24 hours, and the chemical stability of these samples is 12 hours.
Conclusions: The stability and compatibility of OND and HAL in the coadministered admixtures in Viaflo plastic bags with normal saline or dextrose are suggested at 12 hours.
Keywords: HPLC; chemical stability; haloperidol; ondansetron; validated studies.