What are the functions of human immunoglobulin?
Human immunoglobulin is generally used to enhance immune function, treat immunodeficiency diseases, neutralize pathogen toxins, suppress autoimmune reactions, and assist in the treatment of severe infections. The specific applications are as follows:

1. Enhancing immune function: For individuals with low immune function, such as the elderly or patients recovering from chemotherapy or radiotherapy for tumors, human immunoglobulin can supplement antibodies in the body, improve resistance to pathogens, reduce the frequency of infectious diseases like colds and pneumonia, and help maintain immune system stability.
2. Treating immunodeficiency diseases: For congenital immunoglobulin deficiency or secondary immunoglobulin deficiencies, human immunoglobulin can serve as a replacement therapy. Regular long-term use compensates for insufficient antibody levels in the body, helps prevent serious infections, and improves patients' quality of life.
3. Neutralizing pathogen toxins: When the body is infected with toxin-producing pathogens such as *Clostridium tetani* or rabies virus, human immunoglobulin can specifically bind to the toxins, prevent them from attaching to cells, reduce tissue and organ damage caused by the toxins, and assist in controlling the infection.
4. Suppressing autoimmune reactions: During acute flare-ups of autoimmune diseases such as rheumatoid arthritis and systemic lupus erythematosus, human immunoglobulin can modulate immune cell activity, inhibit excessive autoimmune responses, alleviate symptoms such as joint swelling and pain or rashes, and reduce inflammatory damage.
5. Assisting in the treatment of severe infections: In serious infections such as sepsis and severe pneumonia, the combined use of human immunoglobulin alongside anti-infective medications can enhance the effectiveness of infection control, aid in pathogen clearance, shorten the duration of illness, and reduce the risk of complications associated with severe infections.
Human immunoglobulin is a prescription medication and must be used under medical supervision according to individual conditions; self-purchase and injection are not recommended. It must be stored strictly according to temperature requirements to prevent degradation and loss of efficacy.