Mercury cyanide is a toxic substance containing the element mercury, which is toxic to health. Despite the fact that this substance is widely used in industry, it is also in great demand in medicine. For example, it is used as an antiseptic in the fight against infectious diseases. But besides its medicinal uses, mercuric cyanide is also used as a reagent and growth promoter in the jewelry industry. The element mercury itself is very toxic. Therefore, the compound cyanormercury has the same meaning. Mercury cyanide is harmful to the human body. Due to its interaction with protein compounds, many different problems appear in the body related to the gastrointestinal tract, liver, etc. Poisoning with this compound usually leads to indigestion in humans, and the functioning of the liver and kidneys is also impaired. In addition, mercury cyanogen causes metabolic disorders and central nervous system poisoning. Large consumption of this substance can even lead to death. It is also worth noting that mercury is classified as dangerous in poisons. When it enters the human body, it spreads through the circulatory system. The danger to humans also lies in mercury vapor. Inhalation poisoning with them is fraught with the appearance of migraines, vomiting and diarrhea, mental disorders, depression, headaches, and skin diathesis. It is strictly prohibited to consume this element of mercury in food, as this can lead to the destruction of brain cells and the cardiovascular system. If mercury cyanide enters the soil or water bodies, it becomes toxic to fish and other living organisms. For this reason, the disposal of mercury waste in the environment is completely prohibited, and all wastewater must be thoroughly treated for its subsequent harmless disposal. Even human, scaly waste must be disposed of separately and is prohibited with household waste. Thus, the environment should be protected from the ingress of mercury compounds, not pollute nature and take care of its well-being.