Project: Optimized dosing regimens for the combinations of sulfonamides and trimethoprim in veterinary medicine

Acronym SulTAn (Reference Number: JPIAMR2022-007)
Duration 01/02/2023 - 31/01/2026
Project Topic Due to the pending constraints for veterinarians to use antibiotics critically important for human health in Europe, the relative use of first-line antibiotics such as the combination of trimethoprim (TMP) and sulfonamides (S) will increase in all animal species in coming years. Unfortunately, for these old drugs, the selection of the doses does not have a solid scientific basis. For TMP and S, the dose ratio of 1:5 found in veterinary formulations is a direct transposition of the ratio of the human drug and has not been established by considering the pharmacokinetics (PK) of the drugs in each animal species, suggesting that the doses are likely suboptimal. To fill the gaps related to the PK of TMP and S, and to the pharmacodynamics (PD) of their interaction on veterinary pathogens, we have built a consortium of 6 partners recognized as European specialists in veterinary clinical microbiology and pharmacology. Our group will carry out PK studies in dogs, horses, pigs, cattle, goats, poultry and fish and extensive PD studies on most relevant pathogens. By integrating the generated data in PK/PD models, we will be able to compare the expected efficacy of the current dosing regimens of TMP combined to different S, and to identify the needed adjustments to ensure efficacy in all studied species. Our project will contribute to a responsible and prudent use of TMP/S combinations in veterinary medicine and will benefit human and environmental health by avoiding inefficacious treatments and by limiting the recourse to second-line antibiotics more critical for human health.
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Call 2nd JPIAMR-ACTION Joint Call 2022

Project partner

Number Name Role Country
1 INRAE, French National Institute for Agriculture, Food and Environment Coordinator France
2 UNIBE, University of Bern Partner Switzerland
3 RVC, Royal Veterinary College Partner United Kingdom
4 ANSES French Agency for Food, Environmental and Occupational Health & Safety Partner France
5 SLU, Swedish University of Agricultural Sciences Partner Sweden
6 UG, Ghent University, Faculty of Veterinary Medicine Partner Belgium