With two drugs cleared by the U.S. FDA for Niemann-Pick disease type C (NPC) in less than seven days, Wall Street was pondering the differences between the compounds, given what’s known so far about each. Most recently, the FDA approved Intrabio Inc.’s Aqneursa (levacetylleucine) on its PDUFA date for the treatment of neurological manifestations of NPC in adults and pediatric patients weighing at least 15 kg, making Aqneursa the only approved stand-alone therapy indicated for NPC. On Sept. 20, Zevra Therapeutics Inc. won FDA clearance for Miplyffa (arimoclomol) as the first treatment for NPC.