Immunoglobulin injections can have certain side effects, but they are not significant, and the main side effects are as follows: 1. The most common are skin reactions, such as flushing, rash, fever, red rash, maculopapular rash and other allergic effects, which are among the most common types of immunoglobulin side effects. 2. Digestive system side effects, such as nausea, acid reflux, heartburn, palpitations, heartbeat, etc., and serious cases may 3. If too much immunoglobulin is injected or if patients with protein allergy are exposed to immunoglobulin, tachycardia, palpitations, dizziness, heartbeat, difficulty in breathing, and in severe cases, anaphylaxis may occur. However, the chance of the above side effects is very low, so the safety of immunoglobulin injections is very strong.