Medications for Schizophrenia (cont.)

cont. from

The first antipsychotic was discovered by accident and then used for schizophrenia. This was chlorpromazine (Thorazine), which was soon followed by medications such as haloperidol (Haldol), fluphenazine (Prolixin), thiothixene (Navane), trifluoperazine (Stelazine), perphenazine (Trilafon), and thioridazine (Mellaril). These medications have become known as "neuroleptics" because, although effective in treating positive symptoms (ie, acute symptoms such as hallucinations, delusions, thought disorder, loose associations, ambivalence, or emotional lability), they cause side effects, many of which affect the neurologic (nervous) system. These older medications are not as effective against symptoms such as decreased motivation and lack of emotional expressiveness.

Since 1989, a new class of antipsychotics (atypical antipsychotics) has been introduced. At clinically effective doses, no (or very few) of these neurological side effects, which often affect the extrapyramidal nerve tracts (which control such things as muscular rigidity, painful spasms, restlessness, or tremors) are observed.

The first of the new class, clozapine (Clozaril) is the only agent that has been shown to be effective where other antipsychotics have failed. Its use is not associated with extrapyramidal side effects, but it does produce other side effects, including possible decrease in the number of white cells, so the blood needs to be monitored every week during the first 6 months of treatment and then every 2 weeks to catch this side effect early if it occurs.

Other atypical antipsychotics include risperidone (Risperdal), olanzapine (Zyprexa), quetiapine (Seroquel), ziprasidone (Geodon), and aripiprazole (Abilify). The use of these medications has allowed successful treatment and release back to their homes and the community for many people suffering from schizophrenia.

Although more effective and better tolerated, the use of these agents is also associated with side effects, and current medical practice is developing better ways of understanding these effects, identifying people at risk, and monitoring for the emergence of complications.

Most of these medications take 2-4 weeks to take effect. Patience is required if the dose needs to be adjusted, the specific medication changed, and another medication added. In order to be able to determine whether an antipsychotic is effective or not, it should be tried for at least 6-8 weeks (or even longer with clozapine).

Because the risk of relapse of illness is higher when antipsychotic medications are taken irregularly or discontinued, it is important that people with schizophrenia follow a treatment plan developed in collaboration with their doctors and with their families. The treatment plan will involve taking the prescribed medication in the correct amount and at the times recommended, attending follow-up appointments, and following other treatment recommendations.

People with schizophrenia often do not believe that they are ill or that they need treatment. Other possible things that may interfere with the treatment plan include side effects from medications, substance abuse, negative attitudes towards treatment from families and friends, or even unrealistic expectations. When present, these issues need to be acknowledged and addressed for the treatment to be successful.

continue: Other Therapies for Treating Schizophrenia

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Reviewed: 03/2006