A creamy white paste with broad antibacterial activity. Presented in disposable dial-a-dose plastic syringes for oral administration to horses. Each 45 g syringe contains: Trimethoprim 2.6 g and Sulphadiazine 13.0 g and as antimicrobial preservatives methyl hydroxybenzoate 8 mg and propyl hydroxybenzoate 9 mg.