Spectra Sure Plus IGR Drops for All Weights Cats (Generic Frontline) Contains fipronil & (S)-methoprene, the active ingredients used in Frontline Plus for Cats Kills flea eggs and flea larvae for up to 6 weeks Kills ticks, including those that may transmit Lyme disease Can be used on breeding, pregnant and lactating cats Effective after bathing and exposure to water and sunlight