Nicotinamide is a drug that acts on dogs' external parasites. When given to dogs, it will not have any side effects when taken according to the relevant specifications. If you accidentally give your dog too much Nicotine, it will cause gastrointestinal discomfort and side effects of vomiting and diarrhea. Furthermore, Nicotine is a mite and parasite repellent drug, which is suitable for insects that are difficult to eliminate. If your dog only needs simple deworming, it is recommended to choose other deworming products.