A person who is psychotic is out of touch with reality. People with psychosis may hear "voices" or have strange and illogical ideas (for example, thinking that others can hear their thoughts, or are trying to harm them, or that they are the President of the United States or some other famous person). They may get excited or angry for no apparent reason, or spend a lot of time by themselves, or in bed, sleeping during the day and staying awake at night. The person may neglect appearance, not bathing or changing clothes, and may be hard to talk to--barely talking or saying things that make no sense. They often are initially unaware that their condition is an illness.
These kinds of behaviors are symptoms of a psychotic illness such as schizophrenia. Antipsychotic medications act against these symptoms. These medications cannot "cure" the illness, but they can take away many of the symptoms or make them milder. In some cases, they can shorten the course of an episode of the illness as well.
There are a number of antipsychotic (neuroleptic) medications available. These medications affect neurotransmitters that allow communication between nerve cells. One such neurotransmitter, dopamine, is thought to be relevant to schizophrenia symptoms. All these medications have been shown to be effective for schizophrenia. The main differences are in the potency--that is, the dosage (amount) prescribed to produce therapeutic effects-and the side effects. Some people might think that the higher the dose of medication prescribed, the more serious the illness; but this is not always true.
The first antipsychotic medications were introduced in the 1950s. Antipsychotic medications have helped many patients with psychosis lead a more normal and fulfilling life by alleviating such symptoms as hallucinations, both visual and auditory, and paranoid thoughts. However, the early antipsychotic medications often have unpleasant side effects, such as muscle stiffness, tremor, and abnormal movements, leading researchers to continue their search for better drugs.
The 1990s saw the development of several new drugs for schizophrenia, called "atypical antipsychotics." Because they have fewer side effects than the older drugs, today they are often used as a first-line treatment. The first atypical antipsychotic, clozapine (Clozaril), was introduced in the United States in 1990. In clinical trials, this medication was found to be more effective than conventional or "typical" antipsychotic medications in individuals with treatment-resistant schizophrenia (schizophrenia that has not responded to other drugs), and the risk of tardive dyskinesia (a movement disorder) was lower. However, because of the potential side effect of a serious blood disorder--agranulocytosis (loss of the white blood cells that fight infection)-patients who are on clozapine must have a blood test every 1 or 2 weeks. The inconvenience and cost of blood tests and the medication itself have made maintenance on clozapine difficult for many people. Clozapine, however, continues to be the drug of choice for treatment-resistant schizophrenia patients.
Several other atypical antipsychotics have been developed since clozapine was introduced, they are risperidone (Risperdal), aripiprazole (Abilify), olanzapine (Zyprexa), quetiapine (Seroquel), and ziprasidone (Geodon). Each has a unique side effect profile, but in general, these medications are better tolerated than the earlier drugs. Click on the links above to each drug for more information about side effects.
All these medications have their place in the treatment of schizophrenia, and doctors will choose among them. They will consider the person's symptoms, age, weight, and personal and family medication history.
Dosages and side effects. Some drugs are very potent and the doctor may prescribe a low dose. Other drugs are not as potent and a higher dose may be prescribed.
Unlike some prescription drugs, which must be taken several times during the day, some antipsychotic medications can be taken just once a day. In order to reduce daytime side effects such as sleepiness, some medications can be taken at bedtime. Some antipsychotic medications are available in "depot" forms that can be injected once or twice a month.
Most side effects of antipsychotic medications are mild. Many common ones lessen or disappear after the first few weeks of treatment. These include drowsiness, rapid heartbeat, and dizziness when changing position.