This is a Phase 2, multicenter, randomized, double blinded, placebo-controlled study to evaluate the efficacy, safety, tolerability, and PK of two dose levels of SPR720 compared with placebo for the treatment of patients with NTM-PD due to MAC. 31 patients 18 years and older with a diagnosis of NTM-PD due to MAC will be enrolled and treated for 56 days (about 27 treatment naive, treatment inexperienced patients with NTM-PD will be randomized in a 1:1:1 ratio to receive placebo, SPR720 500 mg, or SPR720 1000 mg in a blinded manner.
Sparse PK Group (Treatment Arms 1-3): For all remaining patients, Sparse PK blood samples will be collected pre-dose (no greater than 1 h prior to dosing) on Days 7, 14 and 28; and post- dose on Day 14 (at 1 h, and 3 h), and just before discharge from the clinic (at least 6 h post- dose).