Drug: Compazine

Compazine (prochlorperazine) is a phenothiazine derivative, present in Compazine (prochlorperazine) tablets and Spansule sustained release capsules as the maleate. Its chemical name is 2-chloro-10-[3-(4-methyl-1-piperazinyl)propyl]-10H-phenothiazine (Z)-2-butenedioate (1:2). Compazine vials and syrup contain prochlorperazine as the edisylate salt and Compazine suppositories contain prochlorperazine base. Empirical formulas (and molecular weights) are: prochlorperazine maleate—C20H24CIN3S•2C4H4O4 (606.10); prochlorperazine edisylate --C20H24CIN3S•C2H6O6S2 (564.14); and prochlorperazine base—C20H24CIN3S (373.95). Tablets - Each round, yellow-green, coated tablet contains prochlorperazine maleate equivalent to prochlorperazine as follows: 5 mg imprinted SKF and C66; 10 mg imprinted SKF and C67. 5 mg and 10 mg Tablets - Inactive ingredients consist of cellulose, lactose, magnesium stearate, polyethylene glycol, sodium croscarmellose, titanium dioxide, D&C Yellow No. 10, FD&C Blue No. 2, FD&C Yellow No. 6, FD&C Red No. 40, iron oxide, starch, stearic acid and trace amounts of other inactive ingredients, including aluminum lake dyes. Spansule® sustained release capsules - Each Compazine® (prochlorperazine) Spansule capsule is so prepared that an initial dose is released promptly and the remaining medication is released gradually over a prolonged period. Food slows absorption of prochlorperazine and decreases Cmax by 23% and AUC by 13%. Each capsule, with black cap and natural body, contains prochlorperazine maleate equivalent to prochlorperazine. The 10 mg capsule is imprinted 10 mg and 3344 on the black cap and is imprinted 10 mg and SB on the natural body. The 15 mg capsule is imprinted 15 mg and 3346 on the black cap and is imprinted 15 mg and SB on the natural body. Inactive ingredients consist of ammonio methacrylate co-polymer, D&C Green No. 5, D&C Yellow No. 10, FD&C Blue No. 1, FD&C Blue No. 1 aluminum lake, FD&C Red No. 40, FD&C Yellow No. 6, gelatin, hydroxypropyl methylcellulose, propylene glycol, silicon dioxide, simethicone emulsion, sodium lauryl sulfate, sorbic acid, sugar spheres, talc, triethyl citrate, and trace amounts of other inactive ingredients. Vials, 2 mL (5 mg/mL) and 10 mL (5 mg/mL)–Each mL contains, in aqueous solution, 5 mg prochlorperazine as the edisylate, 5 mg sodium biphosphate, 12 mg sodium tartrate, 0.9 mg sodium saccharin and 0.75% benzyl alcohol as preservative. Suppositories - Each suppository contains 2½ mg, 5 mg or 25 mg of prochlorperazine; with glycerin, glyceryl monopalmitate, glyceryl monostearate, hydrogenated cocoanut oil fatty acids and hydrogenated palm kernel oil fatty acids. Syrup - Each 5 mL (1 teaspoonful) of clear, yellow-orange, fruit-flavored liquid contains 5 mg of prochlorperazine as the edisylate. Inactive ingredients consist of FD&C Yellow No. 6, flavors, polyoxyethylene polyoxypropylene glycol, sodium benzoate, sodium citrate, sucrose and water.

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Drowsiness, dizziness, amenorrhea, blurred vision, skin reactions and hypotension may occur. Neuroleptic Malignant Syndrome (NMS) has been reported in association with antipsychotic drugs (see WARNINGS). Cholestatic jaundice has occurred. If fever with grippe-like symptoms occurs, appropriate liver studies should be conducted. If tests indicate an abnormality, stop treatment. There have been a few observations of fatty changes in the livers of patients who have died while receiving the drug. No causal relationship has been established. Leukopenia and agranulocytosis have occurred. Warn patients to report the sudden appearance of sore throat or other signs of infection. If white blood cell and differential counts indicate leukocyte depression, stop treatment and start antibiotic and other suitable therapy. Neuromuscular (Extrapyramidal) Reactions These symptoms are seen in a significant number of hospitalized mental patients. They may be characterized by motor restlessness, be of the dystonic type, or they may resemble parkinsonism. Depending on the severity of symptoms, dosage should be reduced or discontinued. If therapy is reinstituted, it should be at a lower dosage. Should these symptoms occur in children or pregnant patients, the drug should be stopped and not reinstituted. In most cases barbiturates by suitable route of administration will suffice. (Or, injectable Benadryl®|| may be useful.) In more severe cases, the administration of an anti-parkinsonism agent, except levodopa (see PDR), usually produces rapid reversal of symptoms. Suitable supportive measures such as maintaining a clear airway and adequate hydration should be employed. Motor Restlessness: Symptoms may include agitation or jitteriness and sometimes insomnia. These symptoms often disappear spontaneously. At times these symptoms may be similar to the original neurotic or psychotic symptoms. Dosage should not be increased until these side effects have subsided. If these symptoms become too troublesome, they can usually be controlled by a reduction of dosage or change of drug. Treatment with anti-parkinsonian agents, benzodiazepines or propranolol may be helpful. Dystonias: Symptoms may include: spasm of the neck muscles, sometimes progressing to torticollis; extensor rigidity of back muscles, sometimes progressing to opisthotonos; carpopedal spasm, trismus, swallowing difficulty, oculogyric crisis and protrusion of the tongue. These usually subside within a few hours, and almost always within 24 to 48 hours, after the drug has been discontinued. In mild cases, reassurance or a barbiturate is often sufficient. In moderate cases, barbiturates will usually bring rapid relief. In more severe adult cases, the administration of an anti-parkinsonism agent, except levodopa (see PDR), usually produces rapid reversal of symptoms. In children, reassurance and barbiturates will usually control symptoms. (Or, injectable Benadryl may be useful. Note: See Benadryl prescribing information for appropriate children's dosage.) If appropriate treatment with anti-parkinsonism agents or Benadryl fails to reverse the signs and symptoms, the diagnosis should be reevaluated. Pseudo-parkinsonism: Symptoms may include: mask-like facies; drooling; tremors; pillrolling motion; cogwheel rigidity; and shuffling gait. Reassurance and sedation are important. In most cases these symptoms are readily controlled when an anti-parkinsonism agent is administered concomitantly. Anti-parkinsonism agents should be used only when required. Generally, therapy of a few weeks to 2 or 3 months will suffice. After this time patients should be evaluated to determine their need for continued treatment. (Note: Levodopa has not been found effective in pseudo-parkinsonism.) Occasionally it is necessary to lower the dosage of Compazine (prochlorperazine) or to discontinue the drug. Tardive Dyskinesia: As with all antipsychotic agents, tardive dyskinesia may appear in some patients on long-term therapy or may appear after drug therapy has been discontinued. The syndrome can also develop, although much less frequently, after relatively brief treatment periods at low doses. This syndrome appears in all age groups. Although its prevalence appears to be highest among elderly patients, especially elderly women, it is impossible to rely upon prevalence estimates to predict at the inception of antipsychotic treatment which patients are likely to develop the syndrome. The symptoms are persistent and in some patients appear to be irreversible. The syndrome is characterized by rhythmical involuntary movements of the tongue, face, mouth or jaw (e.g., protrusion of tongue, puffing of cheeks, puckering of mouth, chewing movements). Sometimes these may be accompanied by involuntary movements of extremities. In rare instances, these involuntary movements of the extremities are the only manifestations of tardive dyskinesia. A variant of tardive dyskinesia, tardive dystonia, has also been described. There is no known effective treatment for tardive dyskinesia; anti-parkinsonism agents do not alleviate the symptoms of this syndrome. It is suggested that all antipsychotic agents be discontinued if these symptoms appear. Should it be necessary to reinstitute treatment, or increase the dosage of the agent, or switch to a different antipsychotic agent, the syndrome may be masked. It has been reported that fine vermicular movements of the tongue may be an early sign of the syndrome and if the medication is stopped at that time the syndrome may not develop. Contact Dermatitis: Avoid getting the Injection solution on hands or clothing because of the possibility of contact dermatitis. Adverse Reactions Reported with Compazine (prochlorperazine) or Other Phenothiazine Derivatives: Adverse reactions with different phenothiazines vary in type, frequency and mechanism of occurrence, i.e., some are dose-related, while others involve individual patient sensitivity. Some adverse reactions may be more likely to occur, or occur with greater intensity, in patients with special medical problems, e.g., patients with mitral insufficiency or pheochromocytoma have experienced severe hypotension following recommended doses of certain phenothiazines. Not all of the following adverse reactions have been observed with every phenothiazine derivative, but they have been reported with 1 or more and should be borne in mind when drugs of this class are administered: extrapyramidal symptoms (opisthotonos, oculogyric crisis, hyperreflexia, dystonia, akathisia, dyskinesia, parkinsonism) some of which have lasted months and even years–particularly in elderly patients with previous brain damage; grand mal and petit mal convulsions, particularly in patients with EEG abnormalities or history of such disorders; altered cerebrospinal fluid proteins; cerebral edema; intensification and prolongation of the action of central nervous system depressants (opiates, analgesics, antihistamines, barbiturates, alcohol), atropine, heat, organophosphorus insecticides; autonomic reactions (dryness of mouth, nasal congestion, headache, nausea, constipation, obstipation, adynamic ileus, ejaculatory disorders/impotence, priapism, atonic colon, urinary retention, miosis and mydriasis); reactivation of psychotic processes, catatonic-like states; hypotension (sometimes fatal); cardiac arrest; blood dyscrasias (pancytopenia, thrombocytopenic purpura, leukopenia, agranulocytosis, eosinophilia, hemolytic anemia, aplastic anemia); liver damage (jaundice, biliary stasis); endocrine disturbances (hyperglycemia, hypoglycemia, glycosuria, lactation, galactorrhea, gynecomastia, menstrual irregularities, false-positive pregnancy tests); skin disorders (photosensitivity, itching, erythema, urticaria, eczema up to exfoliative dermatitis); other allergic reactions (asthma, laryngeal edema, angioneurotic edema, anaphylactoid reactions); peripheral edema; reversed epinephrine effect; hyperpyrexia; mild fever after large I.M. doses; increased appetite; increased weight; a systemic lupus erythematosus-like syndrome; pigmentary retinopathy; with prolonged administration of substantial doses, skin pigmentation, epithelial keratopathy, and lenticular and corneal deposits. EKG changes–particularly nonspecific, usually reversible Q and T wave distortions–have been observed in some patients receiving phenothiazines. Although phenothiazines cause neither psychic nor physical dependence, sudden discontinuance in long-term psychiatric patients may cause temporary symptoms, e.g., nausea and vomiting, dizziness, tremulousness. Note: There have been occasional reports of sudden death in patients receiving phenothiazines. In some cases, the cause appeared to be cardiac arrest or asphyxia due to failure of the cough reflex. Read the Compazine (prochlorperazine) Side Effects Center for a complete guide to possible side effectsLearn More »

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Notes on Injection Stability–This solution should be protected from light. This is a clear, colorless to pale yellow solution; a slight yellowish discoloration will not alter potency. If markedly discolored, solution should be discarded. Compatibility–It is recommended that Compazine (prochlorperazine) Injection not be mixed with other agents in the syringe. Adults (For children's dosage and administration, see below.) Dosage should be increased more gradually in debilitated or emaciated patients. 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. 1. To Control Severe Nausea and Vomiting Adjust dosage to the response of the individual. Begin with the lowest recommended dosage. Oral Dosage: Tablets: Usually one 5 mg or 10 mg tablet 3 or 4 times daily. Daily dosages above 40 mg should be used only in resistant cases. Spansule capsules: Initially, usually one 15 mg capsule on arising or one 10 mg capsule q12h. Daily doses above 40 mg should be used only in resistant cases. Rectal Dosage: 25 mg twice daily. I.M. Dosage: Initially 5 to 10 mg (1 to 2 mL) injected deeply into the upper outer quadrant of the buttock. If necessary, repeat every 3 or 4 hours. Total I.M. dosage should not exceed 40 mg per day. I.V. Dosage: 2½ to 10 mg (½ to 2 mL) by slow I.V. injection or infusion at a rate not to exceed 5 mg per minute. Compazine (prochlorperazine) Injection may be administered either undiluted or diluted in isotonic solution. A single dose of the drug should not exceed 10 mg; total I.V. dosage should not exceed 40 mg per day. When administered I.V., do not use bolus injection. Hypotension is a possibility if the drug is given by I.V. injection or infusion. Subcutaneous administration is not advisable because of local irritation. 2. Adult Surgery (for severe nausea and vomiting) Total parenteral dosage should not exceed 40 mg per day. Hypotension is a possibility if the drug is given by I.V. injection or infusion. I.M. Dosage: 5 to 10 mg (1 to 2 mL) 1 to 2 hours before induction of anesthesia (repeat once in 30 minutes, if necessary), or to control acute symptoms during and after surgery (repeat once if necessary). I.V. Dosage: 5 to 10 mg (1 to 2 mL) as a slow I.V. injection or infusion 15 to 30 minutes before induction of anesthesia, or to control acute symptoms during or after surgery. Repeat once if necessary. Compazine (prochlorperazine) may be administered either undiluted or diluted in isotonic solution, but a single dose of the drug should not exceed 10 mg. The rate of administration should not exceed 5 mg per minute. When administered I.V., do not use bolus injection. 3. In Adult Psychiatric Disorders Adjust dosage to the response of the individual and according to the severity of the condition. Begin with the lowest recommended dose. Although response ordinarily is seen within a day or 2, longer treatment is usually required before maximal improvement is seen. Oral Dosage: Non-Psychotic Anxiety–Usual dosage is 5 mg 3 or 4 times daily; by Spansule capsule, usually one 15 mg capsule on arising or one 10 mg capsule q12h. Do not administer in doses of more than 20 mg per day or for longer than 12 weeks. Psychotic Disorders including Schizophrenia–In relatively mild conditions, as seen in private psychiatric practice or in outpatient clinics, dosage is 5 or 10 mg 3 or 4 times daily. In moderate to severe conditions, for hospitalized or adequately supervised patients, usual starting dosage is 10 mg 3 or 4 times daily. Increase dosage gradually until symptoms are controlled or side effects become bothersome. When dosage is increased by small increments every 2 or 3 days, side effects either do not occur or are easily controlled. Some patients respond satisfactorily on 50 to 75 mg daily. In more severe disturbances, optimum dosage is usually 100 to 150 mg daily. I.M. Dosage: For immediate control of adult schizophrenic patients with severe symptomatology, inject an initial dose of 10 to 20 mg (2 to 4 mL) deeply into the upper outer quadrant of the buttock. Many patients respond shortly after the first injection. If necessary, however, repeat the initial dose every 2 to 4 hours (or, in resistant cases, every hour) to gain control of the patient. More than three or four doses are seldom necessary. After control is achieved, switch patient to an oral form of the drug at the same dosage level or higher. If, in rare cases, parenteral therapy is needed for a prolonged period, give 10 to 20 mg (2 to 4 mL) every 4 to 6 hours. Pain and irritation at the site of injection have seldom occurred. Subcutaneous administration is not advisable because of local irritation. Children Do not use in pediatric surgery. Children seem more prone to develop extrapyramidal reactions, even on moderate doses. Therefore, use lowest effective dosage. Tell parents not to exceed prescribed dosage, since the possibility of adverse reactions increases as dosage rises. Occasionally the patient may react to the drug with signs of restlessness and excitement; if this occurs, do not administer additional doses. Take particular precaution in administering the drug to children with acute illnesses or dehydration (see under Dystonias). When writing a prescription for the 2½ mg size suppository, write “2½,” not “2.5”; this will help avoid confusion with the 25 mg adult size. 1. Severe Nausea and Vomiting in Children Compazine (prochlorperazine) should not be used in pediatric patients under 20 pounds in weight or 2 years of age. It should not be used in conditions for which children's dosages have not been established. Dosage and frequency of administration should be adjusted according to the severity of the symptoms and the 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 or Rectal Dosage: More than 1 day's therapy is seldom necessary. Weight Usual Dosage Not to Exceed under 20 lbs not recommended 20 to 29 lbs 2½ mg lor 2 times a day 7.5 mg per day 30 to 39 lbs 2½ mg 2 or 3 times a day 10 mg per day 40 to 85 lbs 2½ mg 3 times a day or 5 mg 2 times a day 15 mg per day I.M. Dosage: Calculate each dose on the basis of 0.06 mg of the drug per lb of body weight; give by deep I.M. injection. Control is usually obtained with one dose. 2. In Children with schizophrenia Oral or Rectal Dosage: For children 2 to 12 years, starting dosage is 2½ mg 2 or 3 times daily. Do not give more than 10 mg the first day. Then increase dosage according to patient's response. FOR AGES 2 to 5, total daily dosage usually does not exceed 20 mg. FOR AGES 6 to 12, total daily dosage usually does not exceed 25 mg. I.M. Dosage: For ages under 12, calculate each dose on the basis of 0.06 mg of Compazine (prochlorperazine) per lb of body weight; give by deep I.M. injection. Control is usually obtained with one dose. After control is achieved, switch the patient to an oral form of the drug at the same dosage level or higher.

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No information provided. REFERENCES * norepinephrine bitartrate, Abbott Laboratories.
† phenylephrine hydrochloride, Abbott Laboratories.
‡ phenytoin, Parke-Davis.
§ metrizamide, Sanofi Pharmaceuticals. Last reviewed on RxList: 3/16/2009
This monograph has been modified to include the generic and brand name in many instances.

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For control of severe nausea and vomiting. For the treatment of schizophrenia. Compazine (prochlorperazine) is effective for the short-term treatment of generalized non-psychotic anxiety. However, Compazine (prochlorperazine) is not the first drug to be used in therapy for most patients with non-psychotic anxiety, because certain risks associated with its use are not shared by common alternative treatments (e.g., benzodiazepines). When used in the treatment of non-psychotic anxiety, Compazine (prochlorperazine) should not be administered at doses of more than 20 mg per day or for longer than 12 weeks, because the use of Compazine (prochlorperazine) at higher doses or for longer intervals may cause persistent tardive dyskinesia that may prove irreversible (see WARNINGS). The effectiveness of Compazine (prochlorperazine) as treatment for non-psychotic anxiety was established in 4-week clinical studies of outpatients with generalized anxiety disorder. This evidence does not predict that Compazine (prochlorperazine) will be useful in patients with other non-psychotic conditions in which anxiety, or signs that mimic anxiety, are found (e.g., physical illness, organic mental conditions, agitated depression, character pathologies, etc.). Compazine (prochlorperazine) has not been shown effective in the management of behavioral complications in patients with mental retardation.

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Do not use in patients with known hypersensitivity to phenothiazines. Do not use in comatose states or in the presence of large amounts of central nervous system depressants (alcohol, barbiturates, narcotics, etc.). Do not use in pediatric surgery. Do not use in pediatric patients under 2 years of age or under 20 lbs. Do not use in children for conditions for which dosage has not been established. Last reviewed on RxList: 3/16/2009
This monograph has been modified to include the generic and brand name in many instances.

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(See also ADVERSE REACTIONS.) SYMPTOMS–Primarily involvement of the extrapyramidal mechanism producing some of the dystonic reactions described above. Symptoms of central nervous system depression to the point of somnolence or coma. Agitation and restlessness may also occur. Other possible manifestations include convulsions, EKG changes and cardiac arrhythmias, fever and autonomic reactions such as hypotension, dry mouth and ileus. TREATMENT–It is important to determine other medications taken by the patient since multiple-dose 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 Benadryl. 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, Levophed and Neo-Synephrine 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. Special note on Spansule capsules–Since much of the Spansule capsule medication is coated for gradual release, therapy directed at reversing the effects of the ingested drug and at supporting the patient should be continued for as long as overdosage symptoms remain. Saline cathartics are useful for hastening evacuation of pellets that have not already released medication.

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Tablets–5 and 10 mg, in bottles of 100; in Single Unit Packages of 100 (intended for institutional use only). 5 mg 100's: NDC 0007-3366-20
5 mg SUP 100's: NDC 0007-3366-21
10 mg 100's: NDC 0007-3367-20
10 mg SUP 100's: NDC 0007-3367-21 Spansule capsules–10 and 15 mg, in bottles of 50. 10 mg 50's: NDC 0007-3344-15
15 mg 50's: NDC 0007-3346-15 Vials–2 mL (5 mg/mL), in boxes of 25 and 10 mL (5 mg/mL), in boxes of 1. 2 mL (5 mg/mL), in boxes of 25: NDC 0007-3352-16
10 mL (5 mg/mL), in boxes of 1: NDC 0007-3343-01 Suppositories–2½ mg (for young children), 5 mg (for older children) and 25 mg (for adults), in boxes of 12. 2½ mg, in boxes of 12: NDC 0007-3360-03
5 mg, in boxes of 12: NDC 0007-3361-03
25 mg, in boxes of 12: NDC 0007-3362-03 Syrup–5 mg/5 mL (1 teaspoonful) in 4 fl oz bottles. 5 mg/5 mL, 4 fl oz: NDC 0007-3363-44 Store Compazine (prochlorperazine) vials below 30°C (86°F). Do not freeze. Other dosage forms can be stored between 15° and 30°C (59° and 86°F). Protect from light. Compazine® (prochlorperazine) Spansule capsules are manufactured by International Processing Corporation, Winchester, KY 40391. GlaxoSmithKline, Research Triangle Park, NC 27709. Last reviewed on RxList: 3/16/2009
This monograph has been modified to include the generic and brand name in many instances.

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The antiemetic action of Compazine (prochlorperazine) may mask the signs and symptoms of overdosage of other drugs and may obscure the diagnosis and treatment of other conditions such as intestinal obstruction, brain tumor and Reye's syndrome (see WARNINGS). When Compazine (prochlorperazine) is used with cancer chemotherapeutic drugs, vomiting as a sign of the toxicity of these agents may be obscured by the antiemetic effect of Compazine (prochlorperazine) . Because hypotension may occur, large doses and parenteral administration should be used cautiously in patients with impaired cardiovascular systems. To minimize the occurrence of hypotension after injection, keep patient lying down and observe for at least ½ hour. If hypotension occurs after parenteral or oral dosing, place patient in head-low position with legs raised. If a vasoconstrictor is required, Levophed®* and Neo-Synephrine®† are suitable. Other pressor agents, including epinephrine, should not be used because they may cause a paradoxical further lowering of blood pressure. Aspiration of vomitus has occurred in a few post-surgical patients who have received Compazine (prochlorperazine) as an antiemetic. Although no causal relationship has been established, this possibility should be borne in mind during surgical aftercare. Deep sleep, from which patients can be aroused, and coma have been reported, usually with overdosage. Antipsychotic drugs elevate prolactin levels; the elevation persists during chronic administration. Tissue culture experiments indicate that approximately one third of human breast cancers are prolactin-dependent in vitro, a factor of potential importance if the prescribing of these drugs is contemplated in a patient with a previously detected breast cancer. Although disturbances such as galactorrhea, amenorrhea, gynecomastia and impotence have been reported, the clinical significance of elevated serum prolactin levels is unknown for most patients. An increase in mammary neoplasms has been found in rodents after chronic administration of antipsychotic drugs. Neither clinical nor epidemiologic studies conducted to date, however, have shown an association between chronic administration of these drugs and mammary tumorigenesis; the available evidence is considered too limited to be conclusive at this time. Chromosomal aberrations in spermatocytes and abnormal sperm have been demonstrated in rodents treated with certain antipsychotics. As with all drugs which exert an anticholinergic effect, and/or cause mydriasis, prochlorperazine should be used with caution in patients with glaucoma. Because phenothiazines may interfere with thermoregulatory mechanisms, use with caution in persons who will be exposed to extreme heat. Phenothiazines can diminish the effect of oral anticoagulants. Phenothiazines can produce alpha-adrenergic blockade. Thiazide diuretics may accentuate the orthostatic hypotension that may occur with phenothiazines. Antihypertensive effects of guanethidine and related compounds may be counteracted when phenothiazines are used concomitantly. Concomitant administration of propranolol with phenothiazines results in increased plasma levels of both drugs. Phenothiazines may lower the convulsive threshold; dosage adjustments of anticonvulsants may be necessary. Potentiation of anticonvulsant effects does not occur. However, it has been reported that phenothiazines may interfere with the metabolism of Dilantin®‡ and thus precipitate Dilantin toxicity. The presence of phenothiazines may produce false-positive phenylketonuria (PKU) test results. Long-Term Therapy Given the likelihood that some patients exposed chronically to antipsychotics tardive dyskinesia, it is advised that all patients in whom chronic use is contemplated be given, if possible, full information about this risk. The decision to inform patients and/or their guardians must obviously take into account the clinical circumstances and the competency of the patient to understand the information provided. To lessen the likelihood of adverse reactions related to cumulative drug effect, patients with a history of long-term therapy with Compazine (prochlorperazine) and/or other antipsychotics should be evaluated periodically to decide whether the maintenance dosage could be lowered or drug therapy discontinued. Children with acute illnesses (e.g., chickenpox, CNS infections, measles, gastroenteritis) or dehydration seem to be much more susceptible to neuromuscular reactions, particularly dystonias, than are adults. In such patients, the drug should be used only under close supervision. Drugs which lower the seizure threshold, including phenothiazine derivatives, should not be used with Amipaque®§. As with other phenothiazine derivatives, Compazine (prochlorperazine) should be discontinued at least 48 hours before myelography, should not be resumed for at least 24 hours postprocedure, and should not be used for the control of nausea and vomiting occurring either prior to myelography with Amipaque, or postprocedure. Geriatric Use Clinical studies of Compazine (prochlorperazine) did not include sufficient numbers of subjects aged 65 and over to determine whether elderly subjects respond differently from younger subjects. Geriatric patients are more sensitive to the side effects of antipsychotics, including Compazine (prochlorperazine) . These adverse events include hypotension, anticholinergic effects (such as urinary retention, constipation, and confusion), and neuromuscular reactions (such as parkinsonism and tardive dyskinesia) (see PRECAUTIONS and ADVERSE REACTIONS). Also, postmarketing safety experience suggests that the incidence of agranulocytosis may be higher in geriatric patients compared to younger individuals who received Compazine (prochlorperazine) . In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy (see DOSAGE AND ADMINISTRATION).Last reviewed on RxList: 3/16/2009
This monograph has been modified to include the generic and brand name in many instances.

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