The invention relates to a pharmaceutical composition, comprising an active ingredient obtained from a plant of the Canscora species in the gentianaceae family, particularly an active ingredient obtained from a plant of the Canscora diffusa species. The composition according to the invention, comprising a content of Canscora, may be administered for a plurality of disorders of the central nervous system (CNS), particularly for concentration problems, learning disorders, weak school performance, refusal of school performance, dyslexia, mental retardation and development retardation, delayed speech development, aberration, mental dementia and age-related dementia, Alzheimer's disease, dysmnesia, fragile X syndrome, psychosis, depression, schizophrenia, affective psychosis, mania, states of anxiety and panic, hyperkinetic behavior disorders among children and adults, hallucinations, compulsive disorders such as compulsive washing, behavior abnormalities, anorexia nervosa, lack of motivation, borderline syndrome, autism, bipolar affective disorder, mental impairment, stage fright, nightmares, tic disorder and lack of self-confidence.