LAUSR

BACKGROUND Fatigue is the most common symptom of multiple sclerosis (MS). Amantadine, modafinil and amphetamine-like stimulants are commonly used in clinical practice for treatment of fatigue; however, the evidence supporting their effectiveness is sparse and conflicting. OBJECTIVE To describe the design of a trial study funded by Patient-Centered Outcome Research Institute (PCORI) that will compare the efficacy of commonly used fatigue medications in patients with MS. DESIGN/METHODS The study is a randomized, placebo-controlled, crossover, four-sequence, four-period, double-blind, multicenter trial of three commonly used medications for the treatment of MS-related fatigue (amantadine, modafinil, methylphenidate) versus placebo in fatigued subjects with MS. Adult patients with MS, with an Expanded Disability Status Scale of <7.0 are eligible to participate. Participants will be randomized to one of four predefined sequences of medication administration. Each sequence comprises four 6-week periods of treatment with one of the 3 study drugs or placebo, and three 2-week washout periods between medication periods. RESULTS 136 participants will be randomized over two years in two academic centers in the United States starting in the Summer 2017. Complete enrollment is expected by early 2019. The primary outcome of the study is the modified fatigue impact scale (MFIS) score while participants receive the maximally tolerated dose of each study medication (or placebo). Safety and tolerability of the medications and heterogeneity of treatment effect will also be assessed. CONCLUSIONS Results of the proposed study will provide evidence-based and personalized treatment options for patients affected by MS-related fatigue. Clinicaltrials.gov registration number: NCT03185065.