Acetazolamide Efficacy in Ataxia in PMM2-CDG

This study is double-blind, placebo-controlled, 1:1 randomized clinical therapeutic trial of acetazolamide for the treatment of ataxia in patients with PMM2-CDG. Clinical history and screening data will be reviewed to determine subject eligibility. Potential subjects who have a molecularly and/or biochemical confirmed diagnosis of PMM2-CDG will be consented. Baseline data will be collected prior to randomization and at treatment initiation. Subjects who meet all inclusion criteria and none of the exclusion criteria will be enrolled into the study. Each subject who meets all the inclusion and none of the exclusion criteria will then be randomized to placebo or acetazolamide. They will be administered weight-dependent doses of acetazolamide or an equivalent volume of placebo twice daily by mouth. Initial dose of acetazolamide is 8 mg/kg/day if subjects are taking the liquid formulation, or as per Table 1b if they are taking the capsule formulation. If taking the liquid formulation, the dose of study drug will be increased by 7 mg/kg/day to a maximum of 22 mg/kg/day (not to exceed 1000 mg/day) if well tolerated with no treatment related SAEs or abnormal pH. If the pH is \<7.32, the dose will be reduced by 7 mg/kg/day. The dose will be adjusted similarly according to Table 1b if taking the capsule formulation. Subjects will be randomized after Visit 1, will initiate blinded therapy within the first week, and will continue on prescribed/adjusted blinded treatment until Visit 4. Of note, the concentration of the liquid formulation and the amount of milligrams of acetazolamide per capsule will stay constant, and the volume or number of capsules will be adjusted based on tolerance as assessed by symptoms and laboratories. If an individual is randomized to the placebo arm, the initial volume will be equivalent to 7 mg/kg/day or the initial number of capsules as per Table 1, and volume or number of capsules will also be adjusted based on symptoms and laboratory values each time dose adjustment is planned. Open label period will then begin after Visit 4 up to Visit 9 (see Figure 1 and Table 3). As both the subject and investigator do not know if the subject received placebo or acetazolamide, the dose of acetazolamide will be started at Visit 4 at 8 mg/kg/day and titrated upwards in the same manner in Visits 5 and 6 (remote) as in Visits 2 and 3 (remote). Subjects will have the option to withdraw from the study any time after Visit 4 if they do not wish to proceed onto or continue with the open label phase.