Drontal worming tablet for cats works with a single dose and kills all the common intestinal worms found in cats in the ukthere are about 8 different types of intestinal worm that can infect cats in the uk it is not always easy to spot the symptoms and as your vet will tell you that is why its best to use a reliable worming treatment every three months to prevent any serious worm infection to avoid worms reaching maturity and affecting your cats health and to reduce public health risks