Pharmaceutical preparations and substances for the treatment of epilepsy, convulsions, seizures, pain, multiple sclerosis, neuropathic pain, spinal cord injury, bladder disfunction, peripheral neuropathy, cancer pain, peri-operative pain, rheumatoid arthritis, inflammatory bowel disease, ulcerative colitis, neurogenic symptoms, psychotic disorders, diseases of the central nervous system, stroke and head injury, motion sickness and chemically induced sickness, spasticity, oncology, cancer symptoms, psychiatric illnesses, neurodegenerative diseases, metabolic disorders, obesity, obesity associated with type II diabetes, bulimia, schizophrenia, crohn's disease, alzheimer's, bone disorders, drug, alcohol and nicotine abuse and inflammatory disorders; pharmaceutical preparations and substances for the treatment of pediatric epilepsy; pharmaceutical preparations and substances for the treatment of Dravet syndrome, hypoxic-ischaemic encephalopathy, Lennox-Gastaut syndrome (LGS), tuberous sclerosis syndrome, intractable childhood epilepsy with generalized tonic-clonic seizures (ICE-GTC), generalized epilepsy with febrile seizures plus (GEFS+), dup 15q infantile spasms, and Doose syndrome; herbs for medicinal purposes; medicinal herbs; medicinal oils; medicinal infusions for the treatment of epilepsy, convulsions, seizures, pain, multiple sclerosis, neuropathic pain, spinal cord injury, bladder disfunction, peripheral neuropathy, cancer pain, peri-operative pain, rheumatoid arthritis, inflammatory bowel disease, ulcerative colitis, neurogenic symptoms, psychotic disorders, diseases of the central nervous system, stroke and head injury, motion sickness and chemically induced sickness, spasticity, oncology, cancer symptoms, psychiatric illnesses, neurodegenerative diseases, metabolic disorders, obesity, obesity associated with type II diabetes, bulimia, schizophrenia, crohn's disease, alzheimer's, bone disorders, hypoxic-ischaemic encephalopathy, drug, alcohol and nicotine abuse and inflammatory disorders; pure extracts of medicinal plants and herbs used for the treatment of epilepsy, convulsions, seizures, pain, multiple sclerosis, neuropathic pain, spinal cord injury, bladder disfunction, peripheral neuropathy, cancer pain, peri-operative pain, rheumatoid arthritis, inflammatory bowel disease, ulcerative colitis, neurogenic symptoms, psychotic disorders, diseases of the central nervous system, stroke and head injury, motion sickness and chemically induced sickness, spasticity, oncology, cancer symptoms, psychiatric illnesses, neurodegenerative diseases, metabolic disorders, obesity, obesity associated with type II diabetes, bulimia, schizophrenia, crohn's disease, alzheimer's, hypoxic-ischaemic encephalopathy, bone disorders, drug, alcohol and nicotine abuse and inflammatory disorders; herb teas for medicinal purposes