Coccidiosis is a disease caused by the invasion of the intestinal tract of livestock by coccidian parasites. To treat coccidiosis, sulphamethazine is commonly used. Sulphamethazine is an antibiotic that is effective in treating coccidiosis because it targets the coccidian parasites, which cause the disease. Sulphamethazine works by blocking the growth and reproduction of the coccidian parasites, which helps to reduce the severity of the infection and promote recovery in affected animals.