Anti-histaminic medicine tablets are a type of medication used to treat allergy symptoms caused by histamine release in the body. Histamine is a chemical produced by the immune system that triggers allergic reactions such as sneezing, itching, watery eyes, and a runny nose. These tablets work by blocking the effects of histamine on certain cells in the body. By doing so, they help alleviate symptoms caused by allergies, such as hay fever, pet allergies, and allergic rhinitis.