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While overdosage is less likely to occur with a parenteral than with an oral medication, information pertaining to HALDOL (haloperidol) is presented, modified only to reflect the extended duration of action of haloperidol decanoate.
In general, the symptoms of overdosage would be an exaggeration of known pharmacologic effects and adverse reactions, the most prominent of which would be: 1) severe extrapyramidal reactions, 2) hypotension, or 3) sedation. The patient would appear comatose with respiratory depression and hypotension which could be severe enough to produce a shock-like state. The extrapyramidal reactions would be manifested by muscular weakness or rigidity and a generalized or localized tremor, as demonstrated by the akinetic or agitans types, respectively. With accidental overdosage, hypertension rather than hypotension occurred in a two-year old child. The risk of ECG changes associated with torsade de pointes should be considered.
(For further information regarding torsade de pointes, please refer to ADVERSE REACTIONS.)
Since there is no specific antidote, treatment is primarily supportive. A patent airway must be established by use of an oropharyngeal airway or endotracheal tube or, in prolonged cases of coma, by tracheostomy. Respiratory depression may be counteracted by artificial respiration and mechanical respirators. Hypotension and circulatory collapse may be counteracted by use of intravenous fluids, plasma, or concentrated albumin, and vasopressor agents such as metaraminol, phenylephrine and norepinephrine. Epinephrine should not be used. In case of severe extrapyramidal reactions, antiparkinson medication should be administered, and should be continued for several weeks, and then withdrawn gradually as extrapyramidal symptoms may emerge. ECG and vital signs should be monitored especially for signs of Q-T prolongation or dysrhythmias and monitoring should continue until the ECG is normal. Severe arrhythmias should be treated with appropriate anti-arrhythmic measures.
Since the pharmacologic and clinical actions of HALDOL Decanoate (haloperidol decanoate) 50 and HALDOL Decanoate (haloperidol decanoate) 100 are attributed to HALDOL (haloperidol) as the active medication, Contraindications, Warnings, and additional information are those of HALDOL, modified only to reflect the prolonged action.
HALDOL is contraindicated in severe toxic central nervous system depression or comatose states from any cause and in individuals who are hypersensitive to this drug or have Parkinson's disease.
Last reviewed on RxList: 10/17/2008
This monograph has been modified to include the generic and brand name in many instances.
Additional Haldol Decanoate Information
- Haldol Decanoate Drug Interactions Center: haloperidol decanoate im
- Haldol Decanoate Side Effects Center
- Haldol Decanoate Overview including Precautions
- Haldol Decanoate FDA Approved Prescribing Information including Dosage
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