Treatment of Positive Symptoms in Schizophrenia

Efficacy and Dosage Considerations

For persistent auditory hallucinations, risperidone may require higher doses, with studies documenting reduction in hallucinations from 38% to 19% after 6 weeks with doses of 1-3 mg (average 2.3 mg) 1
The American Academy of Family Physicians recommends starting risperidone with 0.25 mg/day at bedtime, maximum 2-3 mg/day, and olanzapina with 2.5 mg/day at bedtime, maximum 10 mg/day, for control of problematic delusions, hallucinations, severe psychomotor agitation, and combativeness 2
The American Academy of Family Physicians suggests that risperidone and olanzapina have different side effect profiles, with olanzapina having a superior motor safety profile, and risperidone being associated with a higher incidence of akathisia 2

Extrapyramidal symptoms with risperidone can occur at doses ≥2 mg/day; consider dose reduction rather than adding anticholinergic medications 2, 1
Both drugs can cause orthostatic hypotension and sedation, with increased risk in elderly or frail patients 3

The American Academy of Family Physicians recommends starting with the lowest doses, risperidone 0.25-0.5 mg, olanzapina 2.5 mg, and titrating slowly over days to the desired effect 2, 3
Monitor closely for extrapyramidal symptoms (more common with risperidone), sedation, and metabolic effects (more common with olanzapina), and orthostatic hypotension (both drugs) 3

In patients with limited literature, clinical experience supports the use of atypical agents as first-line treatment for early-onset schizophrenia, with olanzapina and risperidone showing positive responses in case reports 6
The European Society for Medical Oncology and the American Academy of Hospice and Palliative Medicine suggest that monotherapy with antipsychotic medication should be the goal, avoiding combination of olanzapina and risperidone due to additive side effects, and treating reversible causes of delirium first 5, 4