Application segmentation reflects the clinical indications that motivate BBB transport strategies. Oncology—targeting primary and metastatic brain tumors—remains the largest share, driven by unmet need for effective chemotherapeutics and high willingness to pay, representing roughly 40% of market value. Neurological disorders such as Alzheimer’s disease, Parkinson’s disease, and epilepsy collectively account for about 30%, propelled by aging populations and expanding disease‑modifying drug pipelines. Infectious diseases (e.g., viral encephalitis, bacterial meningitis) contribute near 12%, where rapid CNS penetration is critical for therapeutic success. Pain management, especially chronic neuropathic pain, occupies roughly 10% as novel opioid‑sparing agents seek central analgesic action. Psychiatric disorders (schizophrenia, depression) comprise the remaining 8%, reflecting cautious adoption of BBB‑targeted modalities amid safety concerns. This Blood‑Brain Barrier Transport Drugs segmentation by application underpins strategic investment decisions, as each therapeutic area exhibits distinct regulatory, reimbursement, and commercialization dynamics.