Cytochrome injection usually refers to cytochrome C injection, which can be mainly used in the clinic as an adjuvant treatment for various tissue hypoxia emergencies. Usually, cytochrome C injection can be used for hypnotic poisoning, cyanide poisoning, carbon monoxide poisoning, cerebrovascular accidents, post-concussion, neonatal asphyxia, severe shock hypoxia, etc. It can also be used for anesthesia and respiratory distress caused by pulmonary diseases and the treatment of palpitation hypoxia caused by various heart diseases. As various cytochromes will be arranged in a certain order to form the cytochrome system, and Fe3+ in its molecules will undergo redox reaction under the action of related enzymes, thus playing the role of transferring electrons, which is also indispensable for cellular respiration. At the same time, cytochrome C can not pass through the cell membrane, so it has no effect on normal people, when there is tissue hypoxia, the cell membrane permeability increases, exogenous agents can enter the cell, can correct the cellular respiration and play a role in the metabolism of substances. This product can cause allergic reactions, but also due to the impurity of the preparation, mixed with pyrogen and cause pyrogenic reactions. Patients are advised to use cytochrome C injection reasonably under the guidance of a doctor, and note that it is forbidden for those who are allergic to the drug.