The Northwick Park 'Functional' Psychosis Study. Phase 2: maintenance treatment

Area of Science:

• Psychiatry
• Neuroscience
• Pharmacology

Background:

• Functional psychotic illness requires long-term management strategies.
• Identifying effective prophylactic treatments for psychosis relapse is crucial.
• Previous studies have explored various pharmacological interventions for psychosis.

Purpose of the Study:

• To compare the prophylactic efficacy of pimozide, lithium, and their combination against placebo in patients with functional psychotic illness.
• To assess the long-term (up to 6 years) effectiveness of these medications in preventing relapse.
• To determine if acute treatment response predicts the need for continued prophylactic medication.

Main Methods:

• A double-blind, placebo-controlled study involving 30 patients with functional psychotic illness.
• Patients had achieved recovery on pimozide, lithium, or both during an acute episode.
• Comparison of relapse rates between pimozide, lithium, pimozide+lithium, and placebo groups over a 6-year period.

Main Results:

• Pimozide demonstrated significantly greater efficacy than placebo in preventing relapse (p=0.01).
• Lithium showed no significant prophylactic effect.
• A significant deterioration in positive symptoms was observed as relapse approached, but other predictive features were not detected.

Conclusions:

• Prophylactic neuroleptic medication, specifically pimozide, is valuable for preventing relapse in patients with functional psychotic illness, even after achieving recovery.
• Acute treatment response does not reliably predict which patients can discontinue medication without risk of relapse.
• Continued neuroleptic therapy may be necessary for sustained remission in this patient population.