KikiBlog: 8 years Tysabri - the drug that changed my (MS) life! Today it's 8 years ago (96 doses) that 'my buddy' Tysabri (natalizumab) joined my life. I'm very lucky that we are getting along that well over that many years! Tysabri has been protective and supportive. It is helping to control my unwanted life companion MS (Multiple Sclerosis), which can be very distressing, harmful and unpredictable. My MS drug history goes back 20 years, have had a few, and Tysabri I call a success – it suits me! Hope we will have much more time together!