If your dog or cat has had side effects after using a tick, flea or worming agent (!), It is extremely important that you report this to the authorities in your country. Reporting information you can find in various Facebook groups:
Facebook group "Does bravecto kill dogs"
has a lot of information about reporting side effects, and about detoxing information when your dog has serious side effects after a drug has been administered. You can also read many personal stories of dog owners who experienced side effects with tick and flea drugs like Bravecto, Nexgard, Simparica etc.