August 1st 1999
One day after Eli Lilly and Company researchers reported finding olanzapine (Zyprexa) superior to risperidone (Risperdal) on some measures in a 28-week comparative study presented to the American College of Neuropsychopharmacology (ACNP) meeting in 1996, Janssen Pharmaceutica Inc. issued a press statement critical of the methodology and results of the study. Janssen then announced it would undertake its own comparative trial. The results of this trial's initial eight-week acute treatment phase were presented at the European College of Neuro-psychopharmacology meeting held Oct. 31, 1998, through Nov. 4, 1998, in Paris. They indicate risperidone has an advantage for positive symptoms such as hallucinations and delusions, and for anxiety/depression in patients with schizophrenia and schizo-affective disorder.