Stability of famotidine in a 3-in-1 total nutrient admixture

The stability of famotidine in a 3-in-1 total nutrient admixture stored at room temperature (24 degrees C) was evaluated over 24 hours. Famotidine injection was diluted to a theoretical concentration of 20 mg/L in a total nutrient admixture containing 5% amino acid injection, 25% dextrose injection, and 2.25% intravenous fat emulsion. Admixtures were prepared in 2-L ethylene-vinyl acetate bags using conventional techniques and stored at room temperature. At 0, 4, 8, 12, and 24 hours, the admixtures were visually inspected for color change, creaming, or phase separation, and samples were obtained for assay with a stability-indicating method of HPLC, using samples obtained at time zero as controls. Two-way analysis of variance was used for data evaluation. There was no evidence of color change, creaming, or phase separation before quantitative analysis was performed, nor was there significant change in observed famotidine concentration over 24 hours. Based upon our data, famotidine intravenous solution 20 mg/L in the solution tested is stable at room temperature for 24 hours.