During MS the body’s immune system turns on its own nerves causing debilitating muscle problems.
Researchers at the University of Cambridge say a cancer drug, which wipes out and resets the immune system, has better results than other options.
However, there is concern that a drugs company is about to increase the cost of the drug as a result.
Around 100,000 people in the UK have multiple sclerosis. When the condition is diagnosed most will have a form of the disease know as relapsing-remitting MS, in which the symptoms can almost disappear for a time, before suddenly returning.