Study to Treat Major Depressive Disorder (MDD) With a New Medication

"Treatment Week 1: 100mg of Ezogabine by mouth three times per day (total daily dose = 300mg) Treatment Week 2: dose will be increased to 150 mg Ezogabine by mouth three times per day (total daily dose = 450mg).~Treatment Week 3: dose will be increased to 200mg of Ezogabine by mouth three times per day (total daily dose = 600mg).~Treatment Week 4: dose will be increased to 250mg of Ezogabine by mouth three times per day (total daily dose = 750mg).~Treatment Week 5: dose will be increased to 300mg of Ezogabine by mouth three times per (total daily dose = 900mg).~Participants will continue to take 900mg of Ezogabine per day and return weekly to the clinic for the remainder of the study.~Following this primary outcome visit, participants will be instructed to taper the study medication over the following 3 weeks based on FDA recommended guidelines as follows:~250 mg po TID daily x 1 week, then 200 mg po daily x 1 week, then 100 mg po daily x 1 week, then discontinue"