Hartz UltraGuard Flea & Tick Drops for cats and kittens are topical treatments designed to kill and prevent fleas and ticks. They typically come in small tubes containing a monthly dose that is applied to the cat's skin in areas difficult for the cat to lick, such as the base of the neck. Benefits the company aims to provide: Flea and tick control: Designed to kill existing fleas and ticks and prevent infestations for up to a month. Ease of application: The tube design allows for direct application to the skin.