NHS has been switching patients including Jonelle Roback from Tysabri to the cheaper drug, Tyruko, triggering side-effects

• MS patients suffer side-effects after NHS England switches to cheaper drug

Jonelle Roback, 55, a retired tax accountant, is one of scores of people with multiple sclerosis (MS) who have suffered debilitating side-effects after being put on to a cheaper new drug while in NHS care.

Here, she tells of her experience after being switched from the drug Tysabri on to its “biosimilar” Tyruko in May last year.