HORSE SULFADIAZINE (PO) RESOURCES Bogan, J. A., Galbraith, A., Baxter, P., Ali, N. M., & Marriner, S. E. (1984). Effect of feeding on the fate of orally administered phenylbutazone, trimethoprim and sulphadiazine in the horse. The Veterinary Record, 115(23), 599–600. https://doi.org/10.1136/vr.115.23.599