“…Such a rebound effect has previously been described after interruption of NTZ treatment. An analysis of >1800 patients who stopped NTZ therapy showed that relapse of disease activity was particularly evident in patients who had had highly active disease before NTZ therapy 42. Similarly, there are some case reports of exacerbation after discontinuation of FTY 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56.…”