In a phase III clinical trial, Pimavanserin had effect in the treatment of psychosis in Parkinson's Disease. Parkinson’s Disease Psychosis usually consists of visual hallucinations and delusions. It is normally due to Parkinson's Disease drugs not Parkinson's Disease. It eventually occurs in up to 60% of people with Parkinson's Disease. Pimavanserin is an antagonist of serotonin 5-HT2A receptors. It is taken orally as a tablet once-a-day.
Patients took 40mg Pimavanserin for only six weeks. So its long term effects have not been assessed. The adverse events were little different from those found in people taking a placebo. Pimavanserin demonstrated significant antipsychotic efficacy and significant improvements in all secondary efficacy measures. Statistically significant benefits were also observed in exploratory measures of nighttime sleep, daytime wakefulness, and caregiver burden.
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