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Frequency of reasons for switching away from MS treatments.
| Reason | Frequency, n (%) |
| Severe side effects of previous drug | 464 (37.60) |
| Lack of efficacy of previous drug | 310 (25.12) |
| Physician’s advice | 193 (15.64) |
| Ease of use of new drug | 163 (13.21) |
| Worsening quality of life | 39 (3.16) |
| Safety concerns | 38 (3.08) |
| Insurance issues | 13 (1.05) |
| High cost | 7 (0.57) |
| Other | 7 (0.57) |
