There was a time in 2012-2014 where I spent a lot of my free time and my unlimited scientific journal access reading about multiple sclerosis drug development and testing. Tysabri didn’t show very promising outcomes then (except when they sponsored the test!), so I’m sorry to hear that it’s the best option for some patients and sorrier still that a cheap alternative is making them worse.
MS patients suffer side-effects after NHS England switches to cheaper drug
Scores of people experience complications after change from Tysabri to Tyruko as part of NHS drive to save money
theguardian.com