How long does ivig stay in the body?

Intravenous immunoglobulin (IVIG) typically has a half-life of about 21 to 30 days, meaning it can remain in the body for several weeks after administration. However, its effects may vary depending on individual factors such as the patient's immune response and the specific condition being treated. Generally, the immunoglobulins provided by IVIG can persist in circulation and provide immune support for an extended period, but they gradually decrease over time.