Pharmaceutical compositions and preparations for the treatment of neuropathic pain, neurodegenerative diseases, neurological conditions, and degenerative brain diseases; pharmaceutical compositions and preparations for the treatment of schizophrenia, Amyotrophic lateral 15 sclerosis (ALS), Parkinson's disease, multiple sclerosis (MS), Alzheimer's disease, motor neurone disease, cognitive disorders, memory impairment, memory deficit, senile dementia, cognitive impairment, stroke, traumatic bra...