Sodium nitrite injection is used in the treatment of cyanide poisoning. Adverse reactions such as nausea, vomiting, dizziness, headache, cold sweat, cyanosis, shortness of breath, fainting, hypotension, shock, and convulsions can occur. Sodium nitrite injection is used clinically in the treatment of cyanide poisoning. Adverse reactions such as nausea, vomiting, dizziness, headache, cold sweat, cyanosis, shortness of breath, fainting, hypotension, shock, and convulsions may occur during treatment. The extent of adverse reactions is related to the rate at which the product is injected, in addition to excessive dosage. Due to the guidance of a specialized physician on dosage and use. Sodium nitrite injection for patients with cardiovascular and arteriosclerosis need to be applied, the dose should be appropriately reduced and slow down the speed of injection. It should be noted that this product in cyanide poisoning only temporarily delays its toxicity. It must be applied at the early stage of poisoning, and there is no antidote effect if the poisoning lasts a little longer. If symptoms of cyanide poisoning occur, seek medical treatment promptly.