Ketorolac is a nonsteroidal anti-inflammatory drug that possesses potent analgesic activity comparable to morphine. The opioid shortage in the United States has led to an unreliable supply of opioids for use in rehabilitation facilities, thus underscoring the need for research on the safe and effective use of nonopioid alternatives. The goal of this study was to determine the pharmacokinetics of ketorolac after a single 0.25 mg/kg intramuscular injection administered to injured Eastern box turtles (Terrapene carolina carolina). A sparse blood sampling protocol was used to collect samples from 32 wild turtles that presented to the Turtle Rescue Team at North Carolina State University for traumatic injuries. Blood was collected from 0 to 24 hr after injection and analyzed via high-pressure liquid chromatography (HPLC). A nonlinear mixed-effects (NLME) model was fitted to the data to obtain typical values for population parameters. Using this approach, we identified a long half-life (T ) of 9.78 hr and a volume of distribution (V ) of 0.26 L/kg. We have concluded that this long T for a dose of 0.25 mg/kg ketorolac-injected IM provides plasma levels above a previously published target level for 24-hour analgesia to allow for once daily dosing.
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