Antimonials are compounds that contain the element antimony, which is a metalloid found in nature. These compounds have been used historically in medicine and industry, particularly in the production of flame retardants and alloys. Antimonials can also refer to various forms of antimony, such as antimony trioxide and antimony sulfide, each having distinct properties and applications. In medicine, antimonials were once used to treat diseases like leishmaniasis, but their use has declined due to potential toxicity and side effects. Today, they are primarily utilized in industrial processes, including the manufacturing of glass and ceramics, where they help improve durability and resistance to heat.