Use and Safety of Antipsychotic Drugs During Pregnancy

The incidence of schizophrenia in the general population ranges from about 1% to 2%. Schizophrenia affects men and women equally, occurring in all cultures and socioeconomic classes. The peak age of onset in women is 25-35 years, which are also the peak childbearing years, and women with psychotic illnesses are likely to have more unplanned pregnancies than women without a psychotic illness. Not only are antipsychotic medications prescribed for schizophrenia, but, especially since the introduction of the second-generation (atypical) antipsychotics, these drugs are also used to treat other psychiatric illnesses such as bipolar disorder. As a result, there is an increase in the number of women requiring antipsychotic drug therapy who are likely to become pregnant. It is important to evaluate the safety of these drugs in pregnancy, as most women with a serious psychiatric illness cannot stop taking their medication, as this would interfere with their activities of daily living, especially taking care of an infant. In this review, we describe available up-to-date, evidence-based information regarding the safety of antipsychotic drugs that are currently used in pregnancy. These include first-generation (conventional) antipsychotics (e.g., promethazine, chlorpromazine, prochlorperazine, haloperidol, perphenazine, trifluoperazine, loxapine, thioridazine, flupenthixol, fluphenazine) and second-generation antipsychotics (e.g., clozapine, risperidone, olanzapine, quetiapine, ziprasidone, aripiprazole, paliperidone). To date, no definitive association has been found between use of antipsychotics during pregnancy and an increased risk of birth defects or other adverse outcomes. However, there is a paucity of information, with a lack of large, well designed, prospective comparative studies. The information presented here should therefore not be interpreted as conclusive with regard to the safety of these drugs, as more research is needed. Women who require treatment should always discuss the risks and benefits of pharmacotherapy with their physician and, if it is felt that treatment should be continued during pregnancy, the evidenced-based information presented here will be of help in this important decision. (Journal of Psychiatric Practice 2009;15:183-192)