Haldol uses

An encephalopathic syndrome (characterized by weakness, lethargy , fever, tremulousness and confusion, extrapyramidal symptoms, leukocytosis , elevated serum enzymes, BUN , and fasting blood sugar) followed by irreversible brain damage has occurred in a few patients treated with lithium plus HALDOL. A causal relationship between these events and the concomitant administration of lithium and HALDOL has not been established; however, patients receiving such combined therapy should be monitored closely for early evidence of neurological toxicity and treatment discontinued promptly if such signs appear.

Haloperidol is a typical butyrophenone type antipsychotic that exhibits high affinity dopamine D 2 receptor antagonism and slow receptor dissociation kinetics. [42] It has effects similar to the phenothiazines . [18] The drug binds preferentially to D 2 and α 1 receptors at low dose (ED 50 = and  mg/kg, respectively), and 5-HT 2 receptors at a higher dose (ED 50 =  mg/kg). Given that antagonism of D 2 receptors is more beneficial on the positive symptoms of schizophrenia and antagonism of 5-HT 2 receptors on the negative symptoms, this characteristic underlies haloperidol's greater effect on delusions, hallucinations and other manifestations of psychosis. [43] Haloperidol's negligible affinity for histamine H 1 receptors and muscarinic M 1 acetylcholine receptors yields an antipsychotic with a lower incidence of sedation, weight gain, and orthostatic hypotension though having higher rates of treatment emergent extrapyramidal symptoms .

The one reasonably common adverse effect of acute IM Haldol administration is a  dystonic reaction.  Dystonic reactions involve involuntary muscle contractions  usually in the neck, shoulders or face, but also elsewhere.  It can also manifest as akesthesia, which can be thought of as a case of restless legs from hell.  We are not talking here about Tardive Dyskinesia. Tardive Dyskinesia is also involuntary muscle contractions but these occur after years of neuroleptic medication use and are irreversible.  Acute dystonic reactions are easily reversible, using an antihistamine, like Benadryl.  Unlike tardive dyskinesia, dystonic reactions are a nuisance, trivial and easily treated.

Haldol uses

haldol uses

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