Pharmaceutical products for use in the treatment of central nervous system and neurological diseases and disorders, migraines and headaches, pain, respiratory diseases and disorders, and asthma; drug delivery devices, namely, inhalers containing pre-filled drug cartridges which deliver medication in liquid form via the pulmonary route, either directly to the lungs or for absorption and delivery in systemic circulation for use in the treatment of central nervous system and neurological diseases and disorders, migraines and headaches, pain, respiratory diseases and disorders, and asthma