After a pet cat eats a cockroach, you should confirm whether cockroach medicine has been used at home. If cockroach medicine has been used, it is best to take the cat to a pet hospital for vomiting treatment to prevent the cat from accidentally eating cockroaches that have eaten cockroach medicine. In the case of poisoning; if you have not used cockroach medicine at home, it will be fine. You only need to deworm the cat regularly to prevent the cat from being infected with internal parasites.