Author(s): FELIX, L. A.; GONZAGA, L. W. F.; SOARES, B. C. F.; SUÁREZ, G.; BRANDAO, H. de M.; FACCIOLI-MARTINS, P. Y.; FERRANTE, M.

Summary: This study aims to determine therapeutic protocols of intramuscular sodium cloxacillin (IM) in goats with potential antibacterial effects against Staphylococcus spp. We constructed a pharmacokinetic (PK) model of IM, followed by a pharmacokinetic/pharmacodynamic integration (PK/PD). Simulations of different therapeutic protocols were then performed, with the doses ranging from 30 to100 mg/kg every 8, 12, or 24 hours. We calculated the probability to target attainment (PTA) of reach protocol's therapeutic according to the minimum inhibitory concentration (MIC) range of 0.06 to 4 μg/mL. The PK/PD index (PDT) used was "time above the MIC for 40% of the time" (T>MIC ≥40%). Protocols with single administration per day were incapable of achieving PTA ≥ 90% for any of the estimated MICs. However, by decreasing the administration interval, the PTA was increased. Thus, from the dose of 50 mg/kg every 12 hours, a PTA≥ 90% for MICs ≤ 0.5 μg/mL was achieved, while the 30 mg/kg dose every 8 hours was able to achieve a PTA≥ 90% for MICs of 2 μg/mL. The results suggest using 30 mg/kg dose every 8 hours in clinical studies of agents with MICs ≤ 2μg/mL; Nevertheless, the practitioner should adjust the dose in severe patients.

Publication year: 2023

Types of publication: Journal article

Unit: Embrapa Dairy Cattle

Keywords: Antibiotic therapy, Antibioticoterapia, Antimicrobial resistance, Antimicrobiano, Caprino, Farmacologia, Farmacometria, Modelo translacional, Resistência antimicrobiana, Sepse, Sepsis, Simulação de Monte Carlo