Immune deficient patients are at a greater risk of infection than others. Clinical trials have shown that for people with immune deficiency, immunoglobulin treatments result in fewer infections, and those infections that do occur tend to be less serious. There is also evidence that people with immune deficiency are more likely to enjoy good health over many years if they receive immunoglobulin correctly. Finally, your wellbeing and your energy levels are likely to be better if you are on immunoglobulin. Please note that it may take several months before you feel these benefits.