Dicyclanil is an insect growth regulator primarily used in veterinary medicine to prevent cutaneous myiasis, commonly known as flystrike, in sheep and other livestock. It is typically applied as a topical pour-on formulation, where it is absorbed systemically through the skin and distributed throughout the animal's body.

Dicyclanil acts by interfering with the hormonal processes essential for the development and maturation of fly larvae, particularly those of blowflies (Calliphoridae) and other dipteran species. This disruption prevents the larvae from completing their life cycle, effectively protecting treated animals from painful and potentially fatal infestations.

Valued for its long-lasting efficacy, often providing protection for 4-6 weeks or more with a single application, dicyclanil is compatible with integrated animal health management practices. It has a favorable safety profile for use on livestock and minimal impact on non-target organisms when used as directed.