haldol side effects overdose half life

Prescribing Information

DESCRIPTION
Haloperidol decanoate is the decanoate ester of the butyrophenone, HALDOL (haloperidol) haldol side effects overdose half life. It has a markedly extended duration of effect haldol side effects overdose half life. It is available in sesame oilin sterile form for intramuscular (IM) injection haldol side effects overdose half life. The structural formula ofhaloperidol decanoate, 4-(4-chlorophenyl)-1-[4-(4-fluorophenyl)-4-oxobutyl]-4piperidinyl decanoate, is:

Haloperidol decanoate is almost insoluble in water (0.01 mg/mL), but is solublein most organic solvents haldol side effects overdose half life.

Each mL of HALDOL Decanoate 50 for IM injection contains 50 mg haloperidol(present as haloperidol decanoate 70.52 mg) in a sesame oil vehicle, with 1.2%(w/v) benzyl alcohol as a preservative haldol side effects overdose half life.

Each mL of HALDOL Decanoate 100 for IM injection contains 100 mg haloperidol(present as haloperidol decanoate 141.04 mg) in a sesame oil vehicle, with 1.2%(w/v) benzyl alcohol as a preservative haldol side effects overdose half life.

CLINICAL PHARMACOLOGY
HALDOL Decanoate 50 and HALDOL Decanoate 100 are the long-acting forms of HALDOL(haloperidol) haldol side effects overdose half life. The basic effects of haloperidol decanoate are no different fromthose of HALDOL with the exception of duration of action haldol side effects overdose half life. Haloperidol blocksthe effects of dopamine and increases its turnover rate; however, the precisemechanism of action is unknown haldol side effects overdose half life.

Administration of haloperidol decanoate in sesame oil results in slow and sustainedrelease of haloperidol haldol side effects overdose half life. The plasma concentrations of haloperidol gradually rise,reaching a peak at about 6 days after the injection, and falling thereafter,with an apparent half-life of about 3 weeks haldol side effects overdose half life. Steady state plasma concentrationsare achieved after the third or fourth dose haldol side effects overdose half life. The relationship between dose ofhaloperidol decanoate and plasma haloperidol concentration is roughly linearfor doses below 450 mg haldol side effects overdose half life. It should be noted, however, that the pharmacokineticsof haloperidol decanoate following intramuscular injections can be quite variablebetween subjects haldol side effects overdose half life.

INDICATIONS AND USAGE
HALDOL Decanoate 50 and HALDOL Decanoate 100 are indicated for the treatmentof schizophrenic patients who require prolonged parenteral antipsychotic therapy haldol side effects overdose half life.

CONTRAINDICATIONS
Since the pharmacologic and clinical actions of HALDOL Decanoate 50 and HALDOLDecanoate 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 side effects overdose half life.

HALDOL is contraindicated in severe toxic central nervous system depressionor comatose states from any cause and in individuals who are hypersensitiveto this drug or have Parkinson's disease haldol side effects overdose half life.

WARNINGS
Tardive Dyskinesia-- A syndrome consisting of potentially irreversible, involuntary,dyskinetic movements may develop in patients treated with antipsychotic drugs haldol side effects overdose half life. Although the prevalence of the syndrome appears to be highest among the elderly,especially elderly women, it is impossible to rely upon prevalence estimatesto predict, at the inception of antipsychotic treatment, which patients arelikely to develop the syndrome haldol side effects overdose half life. Whether antipsychotic drug products differ intheir potential to cause tardive dyskinesia is unknown haldol side effects overdose half life.

Both the risk of developing tardive dyskinesia and the likelihood that it willbecome irreversible are believed to increase as the duration of treatment andthe total cumulative dose of antipsychotic drugs administered to the patientincrease haldol side effects overdose half life. However, the syndrome can develop, although much less commonly, afterrelatively brief treatment periods at low doses haldol side effects overdose half life.

There is no known treatment for established cases of tardive dyskinesia, althoughthe syndrome may remit, partially or completely, if antipsychotic treatmentis withdrawn haldol side effects overdose half life. Antipsychotic treatment, itself, however, may suppress (or partiallysuppress) the signs and symptoms of the syndrome and thereby may possibly maskthe underlying process haldol side effects overdose half life. The effect that symptomatic suppression has upon thelong-term course of the syndrome is unknown haldol side effects overdose half life.

Given these considerations, antipsychotic drugs should be prescribed in a mannerthat is most likely to minimize the occurrence of tardive dyskinesia haldol side effects overdose half life. Chronicantipsychotic treatment should generally be reserved for patients who sufferfrom a chronic illness that 1) is known to respond to antipsychotic drugs, and2) for whom alternative, equally effective, but potentially less harmful treatmentsare not available or appropriate haldol side effects overdose half life. In patients who do require chronic treatment,the smallest dose and the shortest duration of treatment producing a satisfactoryclinical response should be sought haldol side effects overdose half life. The need for continued treatment shouldbe reassessed periodically haldol side effects overdose half life.

If signs and symptoms of tardive dyskinesia appear in a patient on antipsychotics,drug discontinuation should be considered haldol side effects overdose half life. However, some patients may requiretreatment despite the presence of the syndrome haldol side effects overdose half life. (For further information aboutthe description of tardive dyskinesia and its clinical detection, please referto ADVERSE REACTIONS .)

Neuroleptic Malignant Syndrome (NMS)-- A potentially fatal symptom complexsometimes referred to as Neuroleptic Malignant Syndrome (NMS) has been reportedin association with antipsychotic drugs haldol side effects overdose half life. Clinical manifestations of NMS arehyperpyrexia, muscle rigidity, altered mental status (including catatonic signs)and evidence of autonomic instability (irregular pulse or blood pressure, tachycardia,diaphoresis, and cardiac dysrhythmias) haldol side effects overdose half life. Additional signs may include elevatedcreatine phosphokinase, myoglobinuria (rhabdomyolysis) and acute renal failure haldol side effects overdose half life.

The diagnostic evaluation of patients with this syndrome is complicated haldol side effects overdose half life. Inarriving at a diagnosis, it is important to identify cases where the clinicalpresentation includes both serious medical illness (e.g., pneumonia, systemicinfection, etc.) and untreated or inadequately treated extrapyramidal signsand symptoms (EPS) haldol side effects overdose half life. Other important considerations in the differential diagnosisinclude central anticholinergic toxicity, heat stroke, drug fever and primarycentral nervous system (CNS) pathology haldol side effects overdose half life.

The management of NMS should include 1) immediate discontinuation of antipsychoticdrugs and other drugs not essential to concurrent therapy, 2) intensive symptomatictreatment and medical monitoring, and 3) treatment of any concomitant seriousmedical problems for which specific treatments are available haldol side effects overdose half life. There is no generalagreement about specific pharmacological treatment regimens for uncomplicatedNMS haldol side effects overdose half life.

If a patient requires antipsychotic drug treatment after recovery from NMS,the potential reintroduction of drug therapy should be carefully considered haldol side effects overdose half life. The patient should be carefully monitored, since recurrences of NMS have beenreported haldol side effects overdose half life.

Hyperpyrexia and heat stroke, not associated with the above symptom complex,have also been reported with HALDOL haldol side effects overdose half life.

General-- A number of cases of bronchopneumonia, some fatal, have followedthe use of antipsychotic drugs, including HALDOL (haloperidol) haldol side effects overdose half life. It has beenpostulated that lethargy and decreased sensation of thirst due to central inhibitionmay lead to dehydration, hemoconcentration and reduced pulmonary ventilation haldol side effects overdose half life. Therefore, if the above signs and symptoms appear, especially in the elderly,the physician should institute remedial therapy promptly haldol side effects overdose half life.

Although not reported with HALDOL, decreased serum cholesterol and/or cutaneousand ocular changes have been reported in patients receiving chemically-relateddrugs haldol side effects overdose half life.

PRECAUTIONS
HALDOL Decanoate 50 and HALDOL Decanoate 100 should be administered cautiouslyto patients:

with severe cardiovascular disorders, because of the possibility of transienthypotension and/or precipitation of anginal pain haldol side effects overdose half life. Should hypotension occur anda vasopressor be required, epinephrine should not be used since HALDOL (haloperidol)may block its vasopressor activity, and paradoxical further lowering of theblood pressure may occur haldol side effects overdose half life. Instead, metaraminol, phenylephrine or norepinephrineshould be used haldol side effects overdose half life.
receiving anticonvulsant medications, with a history of seizures, or with EEGabnormalities, because HALDOL may lower the convulsive threshold haldol side effects overdose half life. If indicated,adequate anticonvulsant therapy should be concomitantly maintained haldol side effects overdose half life.
with known allergies, or with a history of allergic reactions to drugs haldol side effects overdose half life.
receiving anticoagulants, since an isolated instance of interference occurredwith the effects of one anticoagulant (phenindione) haldol side effects overdose half life.

If concomitant antiparkinson medication is required, it may have to be continuedafter HALDOL Decanoate 50 or HALDOL Decanoate 100 is discontinued because ofthe prolonged action of haloperidol decanoate haldol side effects overdose half life. If both drugs are discontinuedsimultaneously, extrapyramidal symptoms may occur haldol side effects overdose half life. The physician should keepin mind the possible increase in intraocular pressure when anticholinergic drugs,including antiparkinson agents, are administered concomitantly with haloperidoldecanoate haldol side effects overdose half life.

In patients with thyrotoxicosis who are also receiving antipsychotic medication,including haloperidol decanoate, severe neurotoxicity (rigidity, inability towalk or talk) may occur haldol side effects overdose half life.

When HALDOL is used to control mania in bipolar disorders, there may be a rapidmood swing to depression haldol side effects overdose half life.

Information for Patients
Haloperidol decanoate may impair the mental and/or physical abilities requiredfor the performance of hazardous tasks such as operating machinery or drivinga motor vehicle haldol side effects overdose half life. The ambulatory patient should be warned accordingly haldol side effects overdose half life.

The use of alcohol with this drug should be avoided due to possible additiveeffects and hypotension haldol side effects overdose half life.

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