Toltrazuril is an anticoccidial, active against all intracellular stages but the mode of action is unknown.

In poultry toltrazuril is absorbed at a rate of at least 50%. The highest equivalent concentrations are found in liver. The active substance is rapidly metabolised in poultry. The main metabolite is characterised as a sulfone-derivative. About 1 week after the last dose this metabolite represents by far the most relevant residue in the animal.

Baycox is compatible with coccidiostats and amoebostats.

A three-five fold overdosage is readily tolerated without any symptoms. If the recommended dose is exceeded beyond 3-5 times there is a decrease in water intake.

Baycox does not interfere with the development of immunity against coccidiosis. As with all anticoccidials, prolonged use may result in the development of resistant strains.