1. Medical Definition of Antimony : a trivalent and pentavalent metalloid element that is commonly metallic silvery white, crystalline, and brittle and is used especially in alloys and semiconductors and in medicine as a constituent of various antiprotozoal agents (as tartar emetic) — symbol Sb — see Chemical Elements Table

2. Effects in Humans Acute and Subchronic Toxicity Antimony poisoning has resulted from accidental occupational inhalation, ingestion of food contaminated by storage containers and therapeutic treatment with tartar emetic (potassium antimony tartrate).37 Antimony compounds have been used for a long time as therapeutic agents for parasitic diseases such as schistosomiasis, leishmaniasis, trypanosomiasis and ulcerative granu-loma.