Natalizumab is a monoclonal antibody that affects the actions of the body's immune system.
Monoclonal antibodies are made to target and destroy only certain cells in the body. This may help to
protect healthy cells from damage.
Natalizumab is used in to treat relapsing forms of multiple sclerosis.
Natalizumab is also used to treat moderate to severe Crohn's disease in adults. It is usually
given after other Crohn's disease medications have been tried without successful treatment of this
condition.
Natalizumab may also be used for other purposes not listed in this medication guide.