Ketamine for MS Fatigue

The purpose of this study is to see whether using ketamine to increase glutamate in the prefrontal cortex can reduce Multiple Sclerosis (MS) related fatigue. The investigator proposes a prospective, crossover, randomized, placebo-controlled study to assess the efficacy and safety of low, single dose Ketamine, to assess its efficacy and safety in patients with MS-related fatigue.

The study treatment is designed in two 28-day cycles: for each cycle, participants will receive study infusion on Day 1 and complete follow-up visits during Days 7 and 28. Participants are randomized 1:1 to receive either ketamine (active treatment) or saline solution (placebo treatment) for their first infusion. They will not be blinded to their study assignment: the study doctor will disclose their assigned treatment group. After their first infusion cycle, participents will crossover to the other treatment group. Worded differently, if a participant received ketamine during their first infusion, they will receive placebo treatment during their second infusion. Conversely, if a participant received saline treatment during their first infusion, they will receive ketamine during their second infusion.