Does quetiapine have mood altering properties?

Area of Science:

• Psychiatry
• Clinical Pharmacology

Background:

• Long-standing psychotic illnesses like schizophrenia and schizoaffective disorder require ongoing medication management.
• Patients often maintain stability on antipsychotic regimens until medication changes necessitate review.

Observation:

• Three male patients with chronic psychotic disorders developed manic symptoms after initiating quetiapine (300-800 mg daily).
• Two patients had no prior manic episodes when treated with antidepressants.
• Previous antidepressant use did not precipitate mania in these individuals.

Findings:

• Quetiapine introduction was temporally associated with the onset of manic symptoms.
• Discontinuation of quetiapine led to mania remission in two patients.
• One patient required augmentation with zuclopenthixol depot while continuing quetiapine; the other two received sodium valproate and quetiapine was stopped.

Implications:

• Quetiapine may have a mood-elevating side effect, potentially useful in treating post-psychotic or bipolar depression.
• The role of quetiapine in managing manic episodes, despite its increasing use as an atypical antipsychotic, remains uncertain.