Wiggles Spot-on for cats consists of Fipronil and (S)-Methoprene to eradicate ticks, fleas and chewing lice. This formulation aims to break the flea life cycle and kill ticks. Sarcoptic mange can be averted by controlling mites through this medication. Use Wiggles spot-on every month for effective treatment. For proper dosage, weigh the pet in advance. For pregnant or breeding cats, contact your vet before using the medication. Fipronil Liquid: 9.8 percent w/v (S)Methoprene: 8.8percent w/v Excipients: Q.S. Vetstar Spot-on for cats consists of Fipronil and (S)-Methoprene to eradicate ticks, fleas and chewing lice. This formulation aims to break the flea life cycle and kill ticks. Sarcoptic mange can be averted by controlling mites through this medication. Use Vetstar spot-on every month for effective treatment.