A new study suggests Risperdal may be linked to 70 percent of pituitary tumors.

The Food and Drug Administration worked in conjunction with Duke University on the study, which found the antipsychotic and similar medications may cause pituitary tumors

According to researchers, Johnson & Johnson's experimental schizophrenia drug - paliperidone has been effective in reducing the adverse effects of the disorder and also demonstrated improvement in patient functioning in all three doses tested in the study.

The data was presented at the American Psychiatric Association's annual meeting in Toronto. The most recent results reinforce the findings of two other late-stage pivotal trials of paliperidone ER, which is administered as a once-a-day tablet

A comparison of five schizophrenia drugs finds most newer treatments fare no better than an older generic drug, despite higher costs, according to a study released Monday.

The only exception is Eli Lilly and Co.'s Zyprexa, which may be better than the other medicines. Apart from being the most expensive drug, the study found Zyprexa users experienced dramatic weight gain and developed a higher risk of diabetes