Chlorpromazine Hydrochloride (Page 4 of 5)

OVERDOSAGE

(See also ADVERSE REACTIONS.)

Symptoms

Primarily symptoms of central nervous system depression to the point of somnolence or coma.

Hypotension and extrapyramidal symptoms.

Other possible manifestations include agitation and restlessness, convulsions, fever, autonomic reactions such as dry mouth and ileus. EKG changes and cardiac arrhythmias.

Treatment

It is important to determine other medications taken by the patient since multiple drug therapy is common in overdosage situations. Treatment is essentially symptomatic and supportive. Early gastric lavage is helpful. Keep patient under observation and maintain an open airway, since involvement of the extrapyramidal mechanism may produce dysphagia and respiratory difficulty in severe overdosage. Do not attempt to induce emesis because a dystonic reaction of the head or neck may develop that could result in aspiration of vomitus. Extrapyramidal symptoms may be treated with anti-parkinsonism drugs, barbiturates, or diphenhydramine hydrochloride. See prescribing information for these products. Care should be taken to avoid increasing respiratory depression.

If administration of a stimulant is desirable, amphetamine, dextroamphetamine, or caffeine with sodium benzoate is recommended. Stimulants that may cause convulsions (e.g., picrotoxin or pentylenetetrazol) should be avoided.

If hypotension occurs, the standard measures for managing circulatory shock should be initiated. If it is desirable to administer a vasoconstrictor, norepinephrine and phenylephrine are most suitable. Other pressor agents, including epinephrine, are not recommended because phenothiazine derivatives may reverse the usual elevating action of these agents and cause a further lowering of blood pressure.

Limited experience indicates that phenothiazines are not dialyzable.

DOSAGE AND ADMINISTRATION–ADULTS

Adjust dosage to individual and the severity of his condition, recognizing that the milligram for milligram potency relationship among all dosage forms has not been precisely established clinically. It is important to increase dosage until symptoms are controlled. Dosage should be increased more gradually in debilitated or emaciated patients. In continued therapy, gradually reduce dosage to the lowest effective maintenance level, after symptoms have been controlled for a reasonable period.

The 100 mg and 200 mg tablets are for use in severe neuropsychiatric conditions.

Elderly Patients – In general, dosages in the lower range are sufficient for most elderly patients. Since they appear to be more susceptible to hypotension and neuromuscular reactions, such patients should be observed closely. Dosage should be tailored to the individual, response carefully monitored, and dosage adjusted accordingly. Dosage should be increased more gradually in elderly patients.

Psychotic Disorders – Increase dosage gradually until symptoms are controlled. Maximum improvement may not be seen for weeks or even months. Continue optimum dosage for 2 weeks; then gradually reduce dosage to the lowest effective maintenance level. Daily dosage of 200 mg is not unusual. Some patients require higher dosages (e.g., 800 mg daily is not uncommon in discharged mental patients).

Hospitalized Patients:
Acute Schizophrenic or Manic States – It is recommended that initial treatment be with chlorpromazine HCI injection until patient is controlled. Usually patient becomes quiet and co-operative within 24 to 48 hours and oral doses may be substituted and increased until the patient is calm. 500 mg a day is generally sufficient. While gradual increases to 2,000 mg a day or more may be necessary, there is usually little therapeutic gain to be achieved by exceeding 1,000 mg a day for extended periods. In general, dosage levels should be lower in the elderly, the emaciated and the debilitated.

Less Acutely Disturbed – 25 mg t.i.d. Increase gradually until effective dose is reached – usually 400 mg daily.

Outpatients – 10 mg t.i.d. or q.i.d., or 25 mg b.i.d. or t.i.d.

More Severe Cases – 25 mg t.i.d. After 1 or 2 days, daily dosage may be increased by 20 to 50 mg at semi-weekly intervals until patient becomes calm and cooperative.

Prompt Control of Severe Symptoms – Initial treatment should be with intramuscular chlorpromazine. Subsequent doses should be oral, 25 to 50 mg t.i.d.

Nausea and Vomiting – 10 to 25 mg q4 to 6h, p.r.n., increased, if necessary.

Presurgical Apprehension – 25 to 50 mg, 2 to 3 hours before the operation.

Intractable Hiccups – 25 to 50 mg t.i.d. or q.i.d. If symptoms persist for 2 to 3 days, parenteral therapy is indicated.

Acute Intermittent Porphyria – 25 to 50 mg t.i.d. or q.i.d. Can usually be discontinued after several weeks, but maintenance therapy may be necessary for some patients.

DOSAGE AND ADMINISTRATION – PEDIATRIC PATIENTS (6 months to 12 years of age)

Chlorpromazine should generally not be used in pediatric patients under 6 months of age except where potentially lifesaving. It should not be used in conditions for which specific pediatric dosages have not been established.

Severe Behavioral Problems

Outpatients – Select route of administration according to severity of patient’s condition and increase dosage gradually as required. Oral: ¼ mg/lb body weight q4 to 6h, p.r.n. (e.g., for 40 lb child – 10 mg q4 to 6h).

Hospitalized Patients – As with outpatients, start with low doses and increase dosage gradually. In severe behavior disorders higher dosages (50 to 100 mg daily and in older children, 200 mg daily or more) may be necessary. There is little evidence that behavior improvement in severely disturbed mentally retarded patients is further enhanced by doses beyond 500 mg per day.

Nausea and Vomiting – Dosage and frequency of administration should be adjusted according to the severity of the symptoms and response of the patient. The duration of activity following intramuscular administration may last up to 12 hours. Subsequent doses may be given by the same route if necessary. Oral: ¼ mg/lb body weight (e.g., 40 lb child – 10 mg q4 to 6h).

Presurgical Apprehension –¼ mg/lb body weight orally 2 to 3 hours before operation.

HOW SUPPLIED

Chlorpromazine Hydrochloride Tablets, USP, 10 mg are available in bottles of 100 (NDC 0832-0300-00) and bottles of 1000 (NDC 0832-0300-10). Chlorpromazine HCl Tablets, USP, 10 mg are round, butterscotch colored, sugar coated tablets, imprinted on one side with “832″ above “10″ and no print on the reverse side.

Chlorpromazine Hydrochloride Tablets, USP, 25 mg are available in bottles of 100 (NDC 0832-0301-00), bottles of 1000 (NDC 0832-0301-10), and unit dose cartons of 100 (NDC 0832-0301-01). Chlorpromazine HCl Tablets, USP, 25 mg are round, butterscotch colored, sugar coated tablets, imprinted on one side with “832″ above “25″ and no print on the reverse side.

Chlorpromazine Hydrochloride Tablets, USP, 50 mg are available in bottles of 100 (NDC 0832-0302-00), bottles of 1000 (NDC 0832-0302-10), and unit dose cartons of 100 (NDC 0832-0302-01). Chlorpromazine HCl Tablets, USP, 50 mg are round, butterscotch colored, sugar coated tablets, imprinted on one side with “832″ above “50″ and no print on the reverse side.

THESE TABLET STRENGTHS LISTED BELOW ARE FOR USE ONLY IN SEVERE NEUROPSYCHIATRIC CONDITIONS.

Chlorpromazine Hydrochloride Tablets, USP, 100 mg are available in bottles of 100 (NDC 0832-0303-00), bottles of 1000 (NDC 0832-0303-10), and unit dose cartons of 100 (NDC 0832-0303-01). Chlorpromazine HCl Tablets, USP, 100 mg are round, butterscotch colored, sugar coated tablets, imprinted on one side with “832″ above “100″ and no print on the reverse side.

Chlorpromazine Hydrochloride Tablets, USP, 200 mg are available in bottles of 100 (NDC 0832-0304-00), bottles of 1000 (NDC 0832-0304-10), and unit dose cartons of 100 (NDC 0832-0304-01). Chlorpromazine HCl Tablets, USP, 200 mg are round, butterscotch colored, sugar coated tablets, imprinted on one side with “832″ above “200″ and no print on the reverse side.

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