RecruitingDrug trialAn Open Label Dose Escalation Study to Assess the Safety, Tolerability, and Pharmacologic Properties of High Dose Ambroxol Hydrochloride in Adult (≥ 18 Years of Age) Subjects With MPS IIIA dose escalation study to evaluate the safety, tolerability, and pharmacologic properties of Ambroxol in adult participants with Sanfilippo disease(s) (MPS3).