Compositions comprising an aryl pyrazole and/or a formamidine, methods and uses thereof

A kit for the treatment or prevention of a parasitic infestation in an animal, comprising:

• (i) least one 1-arylpyrazole compound in a first veterinarily acceptable carrier,
• (ii) at least one formamidine compound in a second veterinarily acceptable carrier, and
• (iii) a dual-cavity container;
• wherein the dual-cavity container comprises a front wall, a divider wall, a rear wall and an opening mechanism at one end of the container;
• the first cavity of the dual-cavity container is defined by the front wall and the divider wall;
• the second cavity of the dual-cavity container is defined by the rear wall and the divider wall;
• and wherein the front wall, the divider wall and the rear wall are coupled along part of their perimeter to define the two cavities;
• the 1-arylpyrazole compound(s) in the first veterinarily acceptable carrier is in the first cavity of the dual-cavity container and the formamidine compound(s) in the second veterinarily acceptable carrier is in the second cavity of the dual-cavity container;
• and wherein the 1-arylpyrazole compound(s) in the first veterinarily acceptable carrier and the formamidine in the second veterinarily acceptable carrier are not in fluid communication.