Ziprasidone chemical structure
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Ziprasidone

Ziprasidone (Geodon®) was the fifth atypical antipsychotic to gain FDA approval. Ziprasidone is FDA approved for the treatment of schizophrenia, and the intramuscular injection form of ziprasidone is approved for acute agitation in schizophrenic patients. Clinical trials were conducted in acute cases of mania. Long-term trials have not been conducted for acute bipolar symptoms. Any "hypersensitivity to the product" -- including any of the adverse events noted during clinical trials-- should be grounds for discontinuance. It has been approved for acute episodes indicative of bipolar type I. It has not been studied in adolescents or children (under age 10). more...

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Such a trial has been ordered by the FDA as one condition during the approval process. The brand name (Geodon®) has been suggested to bring to mind the phrase 'down (don) to earth (geo)' referring to the goals of medication.

Pharmacology

Ziprasidone has a high affinity for dopamine, serotonin, and alpha-adrenergic receptors and a medium affinity for histaminic receptors. Ziprasidone is somewhat unique among the "atypicals" in that it also displays some inhibition of synaptic reuptake of serotonin and norepinephrine, although the clinical significance of this is unknown. The mechanism of action of ziprasidone is unknown. However it is theorized that its antipsychotic activity is mediated primarily by antagonism at dopamine receptors, specifically D2. Serotonin antagonism may also play a role in the effectiveness of ziprasidone, but the significance of 5-HT2A antagonism is debated among researchers. Antagonism at histaminic and alpha adrenergic receptors likely explains some of the side effects of ziprasidone, such as sedation and orthostasis.

Pharmacokinetics

The systemic bioavailability of ziprasidone administered intramuscularly is 100%, or 60%, administered orally with food. After a single dose intramuscular administration, the peak serum concentration typically occurs at about 60 minutes after the dose is administered, or earlier. Steady state plasma concentrations are achieved within one to three days. The mean half-life (T 1/2) ranges from two to five hours. Exposure increases in a dose-related manner and following three days of intramuscular dosing, little accumulation is observed.

Metabolism

Ziprasidone is hepatically metabolized by aldehyde reductase. Minor metabolism occurs via cytochrome P450 3A4. Medication that induce (e.g carbamazepine) or inhibit (e.g. ketoconazole) CYP3A4 have been shown to decrease and increase, respectively, blood levels of ziprasidone. There are no known induces or inhibitors of aldehyde reductase.

Adverse Events

Ziprasidone may increase the QTc interval in some patients and may increase the risk of a type of heart arrythmia known as torsades de pointes. Ziprasidone should be used cautiously in patients taking other medications likely to interact with ziprasidone or increase the QTc interval.

Adverse events reported for ziprasidone include sedation, insomnia, orthostasis, akathisia and other permanent extrapyramidal side-effects such as tardive dyskinesia. Rarely, temporary speech disorders may result.

The medication can cause any conceivable side effect. See the FDA label for more information.

Recently, the FDA required the manufacturers of all atypical antipsychotics to include a warning about the risk of hyperglycemia and Type II diabetes with atypical antipsychotics. Some evidence suggests that ziprasidone may not be as bad as some of the other atypical antipsychotics at causing insulin resistance and weight gain. In fact, in a trial of long term therapy with ziprasidone, overweight patients (BMI>27) actually had a mean weight loss overall. Ziprasidone, though, is not a weight loss drug. The weight loss reflected in this study on ziprsidone was really reflective of patients who had gained weight on other antipsychotics who were now trending back toward their baseline.

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Evaluating the reconstitution of intramuscular ziprasidone (Geodon) into solution
From International Journal of Pharmaceutical Compounding, 1/1/05 by Foy, Elizabeth

STABILITY

Evaluating the reconstitution of intramuscular ziprasidone (Geodon) into solution.

Ewing JD, Rund DA, Votolato NA. Ann Emerg Med 2004; 43(3): 419-420.

The authors are affiliated with either the Department of Emergency Medicine orthe Department of Psychiatry, Ohio State University, Columbus, Ohio. Often, agitated psychiatric patients making emergency room (ER) visits require chemical restraint. If it is not possible forthem to receive oral medication, intramuscular (IM) haloperidol or a combination of haloperidol and lorazepam have been administered. Recently developed atypical antipsychotics have demonstrated advantages over the older typical antipsychotics. Currently, the only atypical antipsychotic marketed for IM administration is ziprasidone (Geodon by Pfizer). The ziprasidone comes as a powder in a glass vial and must be reconstituted with 1.2 mLof sterile water; the recommended IM dose is usually 1 mL (20 mg). Instructions provided by the manufacturer state that the powder and sterile water in the glass vial must be shaken until a colorless to pale-pink solution is observed. As the manufacturer does not provide information on how long the shaking will take, the authors experimented with 16 vials; eight were reconstituted using a commercial agitator, and the other eight were shaken manually. The mean reconstitution time using the agitator was 5.6875 minutes (± 0.53 minutes), and the mean reconstitution time using manual shaking was 2.875 minutes (± 0.3535 minutes). In their admittedly preliminary study, the authors found reconstitution by shaking by hand to be quicker but possibly still taking too long in some ER situations. If regular use of IM ziprasidone is anticipated, other options are to store the reconstituted ziprasidone out of sunlight at room temperature [15 to 3O°C (59 to 86°F)] for 24 hours or in a refrigerator [2 to 8°C (35.6 to 46.4°F)] for up to 7 days.

Copyright International Journal of Pharmaceutical Compounding Jan/Feb 2005
Provided by ProQuest Information and Learning Company. All rights Reserved

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