Treatment: Since there is no specific antidote, treatment is primarily symptomatic and supportive. The risk of ventricular arrhythmias, possibly associated with QT-prolongation should be considered. The patient may appear comatose with respiratory depression and hypotension, which could be severe enough to produce a shock-like state. Hypertension rather than hypotension occurred. The extrapyramidal reactions would be manifested by muscular weakness or rigidity and a generalized or localized tremor.
Manifestations: In general, the symptoms of overdosage would be an exaggeration of known pharmacologic effects and adverse reactions, the most prominent of which would be severe extrapyramidal reactions, hypotension, or sedation.
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