HORSE SULPHADIMETHOXINE (PO) RESOURCES Brown, M. P., Gronwall, R. R., Cook, L. K., & Houston, A. E. (1993). Serum concentrations of ormetoprim/sulphadimethoxine in 1-3-day-old foals after a single dose of oral paste combination. Equine Veterinary Journal, 25(1), 73–74. https://doi.org/10.1111/j.2042-3306.1993.tb02906.x