The information below is intended as a reference only, and should not be taken as medical advice. If you have questions about your medications, consult your pharmacist, doctor, nurse, or other healthcare professional.
Taper Approach. As with antidepressants, some antipsychotics are worse than others. Clozapine, olanzapine, quetiapine, and trifluoperazine are the worst, others like perphenazine, flupenthixol, and sulpiride appear better. Based on the effect of missing doses while on treatment, people will often know before starting to withdraw whether there is likely to be a problem. If no hints of a problem and if used daily for a month or so reduce the dose by a maximum of 25% every week initially or every month if need be. If hints of a problem or if used for longer than a month consider tapering more gradually and ideally with the help of a liquid. For some drugs such as quetiapine and olanzapine, a combination of a benzodiazepine and an anticholinergic may help. Acute withdrawal responds to the original treatment where protracted withdrawal is less likely to – although tardive dyskinesia can be managed to some extent with the original agent.
Initial Withdrawal Symptoms. Agitation, activation, insomnia, rebound psychosis, withdrawal-emergent abnormal movements, nausea, feeling of discomfort, sweating, vomiting, insomnia, sexual dysfunction.
Protracted Withdrawal Symptoms: Tardive dyskinesia, tardive akathisia, tardive dysthymia, stress intolerance, temperature dysregulation, sensory disturbances, food intolerance, and enduring sexual dysfunction.
Bruyere Research Institute
- Antipsychotic deprescribing algorithm [PDF]
- Whiteboard video on using the Antipsychotic Deprescribing Algorithm (YouTube)
- Antipsychotic deprescribing guideline information pamphlet [PDF]
- Patient handout on Antipsychotics [PDF]