Abstract
Ziprasidone is the fifth atypical antipsychotic to become available in the US market. This compound is a serotonin–dopamine-receptor antagonist, with greater affinity for the 5-HT2A receptor than the dopamine D2 receptor. Similar to aripiprazole, this compound also has agonist activity at the serotonin 5-HT1A receptor. This affinity has the potential to have particularly beneficial effects on cognitive and affective abnormalities in schizophrenia. Oral and short-acting intramuscular formulations are available. This compound has recently been approved for the treatment of acute mania as well as for schizo-phrenia. Ziprasidone is associated with low weight gain and a low potential to change lipid and glucose levels. Long-term tolerability data have indicated that initial concerns regarding QTc (corrected cardiac output) prolongation are not a major issue. Recent data have indicated that this compound has short-term antipsychotic efficacy that is equivalent to other members of the class, also with evidence of cognitive enhancement. Finally, longer term data has indicated that ziprasidone is successful in the prevention of relapse and has sustained cognitive benefits. Several issues remain to be addressed, including the efficacy of once-daily dosing, the need to take the medication with food, and the correct dosing strategy.
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