How to use immunosuppressants appropriately For those of us with immune system disorders. The root cause of the disease is a problem with our body’s sentinel ~ the immune system. A part of the immune function defected and attacked its own tissues and organs, causing the disease to occur. It is as if there is a civil war within one’s own body. The drugs we doctors use to treat the disease are immunosuppressants. But because most of the current drugs are non-selective immunosuppressants, it causes that in the middle of the process of treating the disease, the good, bad immune function we suppress. It’s like two people fighting, we can’t fully distinguish who is the good guy and who is the bad guy yet. What we can do is to arrest both people and starve them for a day, both of them are out of energy, so they can’t fight. But while the disease is under control, the normal immune function of a person is also low, so many patients are prone to shingles, gray nails, and easy lung infections. So the attending physician should master the degree of treatment. Those who are too much are not enough.