Abstract
The aim was to supply information about the possibility of replacing the procaine salt with the sodium salt for benzylpenicillin IM treatment in horse in order to diminish the risk for procaine adverse effects. In a crossover study eight horses were given 15mg/kg sodium benzylpenicillin (Na-pc) twice daily or procaine benzylpenicillin (control) once daily IM for four days. The half-life of Na-pc was 1.9h, peak concentration was 14,600ng/mL reached after about 23min. Trough plasma concentration was 281ng/mL and protein binding 62.8%. The fT>MIC for Staphylococcus aureus was 63% and 100% for Streptococcus equi subsp. equi and Streptococcus zooepidemicus, indicating an adequate antimicrobial therapy. However, Na-pc cannot be recommended from a welfare point of view since the horses showed more pain related behaviour and more pain and swelling compared to the control treatment.
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