For the prevention and treatment of diseases caused by Gram-positive and Gram-negative bacteria (Staphylococcus spp., Streptococcus spp., E. coli, Klebsiella spp., Haemophilus spp., Salmonella spp., Shigella spp., Pasteurella spp., Proteus spp., Bordetella spp., Nocardia spp., Enterobacter spp., and Pseudomonas aeruginosa ) like septicemia, respiratory, digestive, genitourinary and secondary bacterial infection after viral diseases. It is also active against protozoa namely Pneumocystis carinii, Coccidia spp., and Toxoplasma spp.