Frontline Plus Purple is a monthly spot-on flea and tick treatment for large dogs weighing 20 to 40 kg. The topical treatment kills adult fleas on the dog and targets flea eggs and larvae in the surrounding environment, breaking the flea life cycle. It also provides protection against paralysis ticks.

Active ingredients fipronil and (S)-methoprene work together — fipronil kills adult fleas and ticks, while (S)-methoprene prevents flea eggs and larvae from developing. This two-stage action reduces environmental flea burden over time, making it effective in households where reinfestation is a concern. Frontline Plus is water-resistant after application and remains effective through swimming or bathing.

Frontline Plus has been a mainstay of flea prevention in Australia for many years, with broad vet and owner familiarity. The combination of flea, tick, and egg control in a monthly spot-on suits large dog owners who want reliable, easy-to-apply protection year-round.