Why ?

ImmunoSuppressants

Since the Myelin damage in MS is believed to be caused by an Auto-Immune Response, some medications used to help shorten attacks or slow the progression of MS work by suppressing the Immune System. Others, like Steroids, treat the Inflammation that accompanies DeMyelination.

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ChemoTherapy

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The literal meaning of the term *Chemo-Therapy* is 'to treat with a chemical agent'; however, it generally refers to the potent Cytotoxic (Cell Killing) agents that are prescribed for some forms of Cancer. These drugs not only kill Tumor Cells, but can destroy the body's own normal cells as well.
The cells that are most vulnerable to Cytotoxic agents are those which grow and divide rapidly. Among those affected are Cancer Cells, Hair and Intestinal Cells, Blood Cells, and White Blood Cells of the Immune System.
The rationale for the use of ChemoTherapy to treat MS stems from the fact that MS is considered to be an AutoImmune Disease, whereby an abnormal, heightened Immune action of certain White Blood Cells mounts an attack on Myelinated Nerves of the Central Nervous System.

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ChemoTherapeutic agents diminishes the numbers of White Blood Cells, and therefore (theoretically) should slow down or halt this destruction.