Tryptamine compositions and methods

There are disclosed pharmaceutically acceptable salts of tryptamine compounds, the use of such salt forms in the treatment of diseases associated with a serotonin 5-HT2 receptor, pharmaceutical compositions such as those adapted for inhalation administration containing the salt forms, methods of delivering the pharmaceutically acceptable salt forms (e.g., via inhalation), and methods of treating diseases or disorders associated with a serotonin 5-HT2 receptor, such as central nervous system (CNS) disorders or psychological disorders, with the salt forms. (Formula (I))