Traumatic brain injury (TBI) can produce a wide range of lasting problems from headaches, sleep disturbance, mood and anxiety disorders, and memory trouble to chronic pain, spasticity, and seizures. Because there is no single proven “cure” for TBI, many patients and clinicians are exploring complementary therapies. Cannabis-derived compounds, especially cannabidiol (CBD) and tetrahydrocannabinol (THC), are getting attention because they interact with brain chemistry that coul