What did a recent study of the long-term effectiveness of antipsychotic drugs find?

Question

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The recent study found that three-fourths of the patients stopped taking their medication within 18 months, indicating that the long-term effectiveness of antipsychotic drugs may be limited. The study did not find that atypical drugs are much more effective than conventional drugs, that the drugs are very effective for over 90 percent of schizophrenic patients, or that there is tolerance to the beneficial effects and doses must be increased after six weeks.

What Did a Recent Study of the Long-Term Effectiveness of Antipsychotic