Sodium Metabisulfite is used as an antioxidant agent in various pharmaceutical formulations. It is extensively used as a food preservative and disinfectant that has been demonstrated to cause sulfide exposure that can affect some organs. Sodium Metabisulfite appears as a white crystalline or powder solid with a slight sulfur odour. It strongly irritates skin and tissues that decompose and emit toxic fumes of sulfur and sodium when heated at high temperatures.