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Ziprasidone, diazepam, or the combination for prevention of cocaine toxicity in a mouse model.

Cleveland NR, Krier S, Heard K

Denver Health Residency in Emergency Medicine, University of Colorado School of Medicine, USA.

BACKGROUND: Acute cocaine poisoning is a common problem in the United States. Sedation with benzodiazepines is the standard treatment, but animal studies have suggested that ziprasidone is also protective. OBJECTIVES: To assess whether the combination of these two medications would offer more protection than either treatment alone. METHODS: This was a randomized, blinded, placebo-controlled trial in CF-1 mice. The authors administered intraperitoneal injections of 2 mg/kg diazepam (group D), 4 mg/kg ziprasidone (group Z), the same dose of both drugs (group DZ), or saline 15 minutes before intraperitoneal administration of 105 mg/kg cocaine (an estimated lethal dose to 70%). The number of animals with seizures and apparent lethality over the following 30 minutes was recorded. RESULTS: All treatments increased survival relative to placebo (relative risk: D = 2.6, Z = 2.3, DZ = 2.9) and decreased seizures (relative risk: D = 0.5, Z = 0.3, DZ = 0.02). CONCLUSIONS: This study suggests that diazepam and ziprasidone have efficacy for preventing lethality from cocaine poisoning in an animal model but that the combination offers little addition to either therapy alone. However, the combination may be more effective for prevention of cocaine-induced seizures.

Published 27 July 2007 in Acad Emerg Med, 14(8): 691-4.
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