L04: Immunosuppressants
ATC L04 holds the immunosuppressants, drugs that dampen the immune system, from calcineurin inhibitors used after transplants to TNF and JAK inhibitors.
L04 has a single level-3 group, L04A, and WHO gives both the same name. L04A sorts the immunosuppressants into level-4 groups, mostly by what they block, such as calcineurin, TNF-α, interleukins and the Janus kinases.