Abstract
In a previous study, tiaprofenic acid (TA) was administered daily over a 30-day period at 5 and 10 mg/kg of body weight subcutaneously (s.c.) to animals with arthritis induced by immobilisation. The 10 mg/kg dose exacerbated the loss of proteoglycan from joint cartilage but the 5 mg/kg dose showed protective effects on articular cartilage. These results led us to investigate the concentration of TA achieved in synovial fluid of both the immobilised and non-immobilised rabbit joints after single s.c doses of 5 or 10 mg/kg. The halflives of elimination of TA from the synovial fluids of the immobilised joints were 1.27 and 1.07 h after the 5 and 10 mg doses, respectively, and 0.66 and 0.39 h in the non-immobilised contralateral joints. Clearances from synovial fluid to plasma were found to be 0.41 and 0.55 ml/h/kg from the immobilised joints after the 5 and 10 mg doses, respectively, and 0.11 and 0.25 ml/h/kg from the non-immobilised contralateral joints. The peak concentration of TA achieved in synovial fluid of immobilised knee joints after a single s.c. injection of 10 mg/kg was approximately two times greater than the concentrations achieved after administration of 5 mg/kg by the same route and two to six times greater than the levels achieved after oral administration of TA at 600 mg/day in humans.
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Meyer-Carrive, I., Graham, G.G. & Ghosh, P. Pharmacokinetics of tiaprofenic acid in normal rabbits and rabbits subjected to joint immobilisation. Agents and Actions 39, 59–68 (1993). https://doi.org/10.1007/BF01975715
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DOI: https://doi.org/10.1007/BF01975715