Promethazine (rectal)
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Black Box Warning
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WARNING
See full prescribing information for complete Boxed Warning.
WARNING:
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Overview
Promethazine (rectal) is a phenothiazine derivative that is FDA approved for the treatment of perennial and seasonal allergic rhinitis.. There is a Black Box Warning for this drug as shown here. Common adverse reactions include dermatitis, phototoxicity, urticaria, nausea, vomiting, xerostomia, CNS depression, dizziness, extrapyramidal disease, lowered convulsive threshold, sedation and somnolence..
Adult Indications and Dosage
FDA-Labeled Indications and Dosage (Adult)
- Phenadoz is useful for:
- Perennial and seasonal allergic rhinitis.
- Vasomotor rhinitis.
- Allergic conjuctivitis due to inhalant allergens and foods.
- Mild, uncomplicated allergic skin manifestations of urticaria and angioedema.
- Amelioration of allergic reactions to blood or plasma.
- Dermographism.
- Anaphylactic reactions, as adjunctive therapy to epinephrine and other standard measures, after the acute manifestations have been controlled.
- Preoperative, postoperative, or obstetric sedation.
- Prevention and control of nausea and vomiting associated with certain types of anesthesia and surgery.
- Therapy adjunctive to meperidine or other analgesics for control of post-operative pain.
- Sedation in both children and adults, as well as relief of apprehension and production of light sleep from which the patient can be easily aroused.
- Active and prophylactic treatment of motion sickness.
- Antiemetic therapy in postoperative patients.
Dosage
- Promethazine HCl Rectal Suppositories, USP are contraindicated for children under 2 years of age (seeWARNINGS- USE IN PEDIATRIC PATIENTS).
- Phenadoz Suppositories are for rectal administration only.
- Allergy
- The average dose is 25 mg taken before retiring; however, 12.5 mg may be taken before meals and on retiring, if necessary. Single 25-mg doses at bedtime or 6.25 to 12.5 mg taken three times daily will usually suffice. After initiation of treatment in children or adults, dosage should be adjusted to the smallest amount adequate to relieve symptoms. The administration of promethazine hydrochloride in 25-mg doses will control minor transfusion reactions of an allergic nature.
- Motion Sickness
- The average adult dose is 25 mg taken twice daily. The initial dose should be taken one-half to one hour before anticipated travel and be repeated 8 to 12 hours later, if necessary. On succeeding days of travel, it is recommended that 25 mg be given on arising and again before the evening meal. For children, Phenadoz Suppositories, 12.5 to 25 mg, twice daily, may be administered.
- Nausea and Vomiting
- Antiemetics should not be used in vomiting of unknown etiology in children and adolescents
- The average effective dose of Phenadoz for the active therapy of nausea and vomiting in children or adults is 25 mg. 12.5- to 25-mg doses may be repeated, as necessary, at 4 to 6 hour intervals.
- For nausea and vomiting in children, the usual dose is 0.5 mg per pound of body weight, and the dose should be adjusted to the age and weight of the patient and the severity of the condition being treated.
- For prophylaxis of nausea and vomiting, as during surgery and the postoperative period, the average dose is 25 mg repeated at 4- to 6-hour intervals, as necessary.
- Sedation
- This product relieves apprehension and induces a quiet sleep from which the patient can be easily aroused. Administration of 12.5 to 25 mg Phenadoz by rectal suppository at bedtime will provide sedation in children. Adults usually require 25 to 50 mg for nighttime, presurgical, or obstetrical sedation.
- Pre- and Postoperative Use
- Phenadoz in 12.5- to 25-mg doses for children and 50-mg doses for adults the night before surgery relieves apprehension and produces a quiet sleep.
- For preoperative medication children require doses of 0.5 mg per pound of body weight in combination with an appropriately reduced dose of narcotic or barbiturate and the appropriate dose of an atropine-like drug. Usual adult dosage is 50 mg Phenadoz with an appropriately reduced dose of narcotic or barbiturate and the required amount of a belladonna alkaloid.
- Postoperative sedation and adjunctive use with analgesics may be obtained by the administration of 12.5 to 25 mg in children and 25-to 50-mg doses in adults.
- Phenadoz Rectal Suppositories are not recommended for children under 2 years of age.
Off-Label Use and Dosage (Adult)
Guideline-Supported Use
There is limited information regarding Off-Label Guideline-Supported Use of Promethazine (rectal) in adult patients.
Non–Guideline-Supported Use
There is limited information regarding Off-Label Non–Guideline-Supported Use of Promethazine (rectal) in adult patients.
Pediatric Indications and Dosage
FDA-Labeled Indications and Dosage (Pediatric)
There is limited information regarding FDA-Labeled Use of Promethazine (rectal) in pediatric patients.
Off-Label Use and Dosage (Pediatric)
Guideline-Supported Use
There is limited information regarding Off-Label Guideline-Supported Use of Promethazine (rectal) in pediatric patients.
Non–Guideline-Supported Use
There is limited information regarding Off-Label Non–Guideline-Supported Use of Promethazine (rectal) in pediatric patients.
Contraindications
- Phenadoz suppositories are contraindicated in comatose states, and in individuals known to be hypersensitive or to have had an idiosyncratic reaction to promethazine or to other phenothiazines.
- Antihistamines are contraindicated for use in the treatment of lower respiratory tract symptoms including asthma.
Warnings
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WARNING
See full prescribing information for complete Boxed Warning.
WARNING:
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- CNS Depression
- Phenadoz Suppositories may impair the mental and/or physical abilities required for the performance of potentially hazardous tasks, such as driving a vehicle or operating machinery. The impairment may be amplified by concomitant use of other central-nervous-system depressants such as alcohol, sedatives/hypnotics (including barbiturates), narcotics, narcotic analgesics, general anesthetics, tricyclic antidepressants, and tranquilizers; therefore such agents should either be eliminated or given in reduced dosage in the presence of promethazine HCl
- Respiratory Depression
- Phenadoz Suppositories may lead to potentially fatal respiratory depression.
- Use of Phenadoz Suppositories in patients with compromised respiratory function (e.g. COPD, sleep apnea) should be avoided.
- Lower Seizure Threshold
- Phenadoz may lower seizure threshold. It should be used with caution in persons with seizure disorders or in persons who are using concomitant medications, such as narcotics or local anesthetics, which may also affect seizure threshold.
- Bone-Marrow Depression
- Phenadoz Suppositories should be used with caution in patients with bone-marrow depression. Leukopenia and agranulocytosis have been reported, usually when promethazine HCl has been used in association with other known marrow-toxic agents.
- Neuroleptic Malignant Syndrome
- A potentially fatal symptom complex sometimes referred to as Neuroleptic Malignant Syndrome (NMS) has been reported in association with promethazine HCl alone or in combination with antipsychotic drugs. Clinical manifestations of NMS are hyperpyrexia, muscle rigidity, altered mental status and evidence of autonomic instability (irregular pulse or blood pressure, tachycardia, diaphoresis and cardiac dysrhythmias).
- The diagnostic evaluation of patients with this syndrome is complicated. In arriving at a diagnosis, it is important to identify cases where the clinical presentation includes both serious medical illness (e.g. pneumonia, systemic infection, etc.) and untreated or inadequately treated extrapyramidal signs and symptoms (EPS). Other important considerations in the differential diagnosis include central anticholinergic toxicity, heat stroke, drug fever and primary central nervous system (CNS) pathology.
- The management of NMS should include 1) immediate discontinuation of promethazine HCl, antipsychotic drugs, if any, and other drugs not essential to concurrent therapy, 2) intensive symptomatic treatment and medical monitoring, and 3) treatment of any concomitant serious medical problems for which specific treatments are available. There is no general agreement about specific pharmacological treatment regimens for uncomplicated NMS.
- Since recurrences of NMS have been reported with phenothiazines, the reintroduction of promethazine HCl should be carefully considered.
- Use in Pediatric Patients
- PROMETHAZINE HCL SUPPOSITORIES, USP ARE CONTRAINDICATED FOR THE USE IN PEDIATRIC PATIENTS LESS THAN TWO YEARS OF AGE.
- CAUTION SHOULD BE EXERCISED WHEN ADMINISTERING PROMETHAZINE HCL SUPPOSITORIES, USP TO PEDIATRIC PATIENTS 2 YEARS OF AGE AND OLDER BECAUSE OF THE POTENTIAL FOR FATAL RESPIRATORY DEPRESSION. RESPIRATORY DEPRESSION AND APNEA, SOMETIMES ASSOCIATED WITH DEATH, ARE STRONGLY ASSOCIATED WITH PROMETHAZINE PRODUCTS AND NOT FIRMLY WEIGHT-RELATED, WHICH MIGHT OTHERWISE PERMIT SAFE ADMINISTRATION OF INDIVIDUALIZED DOSING. CONCOMITANT ADMINISTRATION OF PROMETHAZINE PRODUCTS WITH OTHER RESPIRATORY DEPRESSANTS HAS AN ASSOCIATION WITH RESPIRATORY DEPRESSION, AND SOMETIMES DEATH, IN PEDIATRIC PATIENTS.
- ANTIEMETICS ARE NOT RECOMMENDED FOR TREATMENT OF UNCOMPLICATED VOMITING IN PEDIATRIC PATIENTS, AND THEIR USE SHOULD BE LIMITED TO PROLONGED VOMITING OF KNOWN ETIOLOGY. THE EXTRAPYRAMIDAL SYMPTOMS WHICH CAN OCCUR SECONDARY TO PROMETHAZINE HCL SUPPOSITORIES, USP ADMINISTRATION MAY BE CONFUSED WITH THE CNS SIGNS OF UNDIAGNOSED PRIMARY DISEASE, E.G., ENCEPHALOPATHY OR REYE'S SYNDROME. THE USE OF PROMETHAZINE HCL SUPPOSITORIES, USP SHOULD BE AVOIDED IN PEDIATRIC PATIENTS WHOSE SIGNS AND SYMPTOMS MAY SUGGEST REYE'S SYNDROME OR OTHER HEPATIC DISEASES.
- Excessively large dosages of antihistamines, including Phenadoz Suppositories, in pediatric patients may cause sudden death (See OVERDOSAGE). Hallucinations and convulsions have occurred with therapeutic doses and overdoses of promethazine HCl in pediatric patients. In pediatric patients who are acutely ill associated with dehydration, there is an increased susceptibility to dystonias with the use of promethazine HCl.
- Other Considerations
- Administration of promethazine HCl has been associated with reported cholestatic jaundice.
Precautions
- Drugs having anticholinergic properties should be used with caution in patients with narrow-angle glaucoma, prostatic hypertrophy, stenosing peptic ulcer, pyloroduodenal obstruction, and bladder-neck obstruction.
- Phenadoz Suppositories should be used cautiously in persons with cardiovascular disease or with impairment of liver function.
Adverse Reactions
Clinical Trials Experience
- Central Nervous System
- Drowsiness is the most prominent CNS effect of this drug. Sedation, somnolence, blurred vision, dizziness; confusion, disorientation, and extrapyramidal symptoms such as oculogyric crisis, torticollis, and tongue protrusion; lassitude, tinnitus, incoordination, fatigue, euphoria, nervousness, diplopia, insomnia, tremors, convulsive seizures, excitation, catatonic-like states, hysteria. Hallucinations have also been reported.
- Cardiovascular–Increased or decreased blood pressure, tachycardia, bradycardia, faintness.
- Dermatologic–Dermatitis, photosensitivity, urticaria.
- Hematologic-Leukopenia, thrombocytopenia, thrombocytopenic purpura, agranulocytosis.
- Gastrointestinal-Dry mouth, nausea, vomiting, jaundice.
- Respiratory–Asthma, nasal stuffiness, respiratory depression (potentially fatal) and apnea (potentially fatal). (See WARNINGS– RESPIRATORY DEPRESSION).
- Other-Angioneurotic edema. Neuroleptic malignant syndrome (potentially fatal) has also been reported. (See WARNINGS- NEUROLEPTIC MALIGNANT SYNDROME.)
- Paradoxical Reactions
- Hyperexcitability and abnormal movements have been reported in pediatric patients following a single administration of promethazine HCl. Consideration should be given to the discontinuation of promethazine HCl and to the use of other drugs if these reactions occur. Respiratory depression, nightmares, delirium, and agitated behavior have also been reported in some of these patients.
Postmarketing Experience
There is limited information regarding Postmarketing Experience of Promethazine (rectal) in the drug label.
Drug Interactions
- CNS Depressants - Phenadoz Suppositories may increase, prolong, or intensify the sedative action of other central-nervous-system depressants, such as alcohol, sedatives/hypnotics (including barbiturates), narcotics, narcotic analgesics, general anesthetics, tricyclic antidepressants, and tranquilizers; therefore, such agents should be avoided or administered in reduced dosage to patients receiving promethazine HCl. When given concomitantly with Phenadoz Suppositories, the dose of barbiturates should be reduced by at least one-half, and the dose of narcotics should be reduced by one-quarter to one-half. Dosage must be individualized. Excessive amounts of promethazine HCl relative to a narcotic may lead to restlessness and motor hyperactivity in the patient with pain; these symptoms usually disappear with adequate control of the pain.
- Epinephrine - Because of the potential for Phenadoz to reverse epinephrine's vasopressor effect, epinephrine should NOT be used to treat hypotension associated with Phenadoz Suppositories overdose.
- Anticholinergics - Concomitant use of other agents with anticholinergic properties should be undertaken with caution.
- Monoamine Oxidase Inhibitors (MAOI) - Drug interactions, including an increased incidence of extrapyramidal effects, have been reported when some MAOI and phenothiazines are used concomitantly. This possibility should be considered with Phenadoz Suppositories.
- Drug/Laboratory Test Interactions
- The following laboratory tests may be affected in patients who are receiving therapy with promethazine HCl:
- Pregnancy Tests
- Diagnostic pregnancy tests based on immunological reactions between HCG and anti-HCG may result in false-negative or false-positive interpretations.
- Glucose Tolerance Test
- An increase in blood glucose has been reported in patients receiving promethazine HCl.
Use in Specific Populations
Pregnancy
- Teratogenic Effects
- Teratogenic effects have not been demonstrated in rat-feeding studies at doses of 6.25 and 12.5 mg/kg of promethazine HCl. These doses are from approximately 2.1 to 4.2 times the maximum recommended total daily dose of promethazine for a 50-kg subject, depending upon the indication for which the drug is prescribed. Daily doses of 25 mg/kg intraperitoneally have been found to produce fetal mortality in rats.
- Specific studies to test the action of the drug on parturition, lactation, and development of the animal neonate were not done, but a general preliminary study in rats indicated no effect on these parameters. Although antihistamines have been found to produce fetal mortality in rodents, the pharmacological effects of histamine in the rodent do not parallel those in man.There are no adequate and well-controlled studies of Phenadoz Suppositories in pregnant women.
- Phenadoz Suppositories should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
- Nonteratogenic Effects
- Phenadoz Suppositories administered to a pregnant woman within two weeks of delivery may inhibit platelet aggregation in the newborn.
Pregnancy Category (AUS):
There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Promethazine (rectal) in women who are pregnant.
Labor and Delivery
- Promethazine HCl may be used alone or as an adjunct to narcotic analgesics during labor (See DOSAGE AND ADMINISTRATION). Limited data suggest that use of promethazine HCl during labor and delivery does not have an appreciable effect on the duration of labor or delivery and does not increase the risk of need for intervention in the newborn. The effect on later growth and development of the newborn is unknown.
Nursing Mothers
- It is not known whether promethazine HCl is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from Phenadoz Suppositories, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.
Pediatric Use
- Safety and effectiveness in children under 2 years of age have not been established.
- Phenadoz Suppositories should be used with caution in pediatric patients 2 years of age and older
Geriatic Use
- Clinical studies of promethazine HCl suppositories USP did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. 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.
- Sedating drugs may cause confusion and oversedation in the elderly; elderly patients generally should be started on low doses of Phenadoz Suppositories and observed closely.
Gender
There is no FDA guidance on the use of Promethazine (rectal) with respect to specific gender populations.
Race
There is no FDA guidance on the use of Promethazine (rectal) with respect to specific racial populations.
Renal Impairment
There is no FDA guidance on the use of Promethazine (rectal) in patients with renal impairment.
Hepatic Impairment
There is no FDA guidance on the use of Promethazine (rectal) in patients with hepatic impairment.
Females of Reproductive Potential and Males
There is no FDA guidance on the use of Promethazine (rectal) in women of reproductive potentials and males.
Immunocompromised Patients
There is no FDA guidance one the use of Promethazine (rectal) in patients who are immunocompromised.
Administration and Monitoring
Administration
- Rectal
Monitoring
There is limited information regarding Monitoring of Promethazine (rectal) in the drug label.
IV Compatibility
There is limited information regarding IV Compatibility of Promethazine (rectal) in the drug label.
Overdosage
- Signs and symptoms of overdosage with promethazine HCl range from mild depression of the central nervous system and cardiovascular system to profound hypotension, respiratory depression, unconsciousness, and sudden death. Other reported reactions include hyperreflexia, hypertonia, ataxia, athetosis, and extensor-plantar reflexes (Babinski reflex).
- Stimulation may be evident, especially in children and geriatric patients. Convulsions may rarely occur. A paradoxical-type reaction has been reported in children receiving single doses of 75 mg to 125 mg orally, characterized by hyperexcitability and nightmares.
- Atropine-like signs and symptoms– dry mouth, fixed, dilated pupils, flushing, as well as gastrointestinal symptoms, may occur.
Treatment
- Treatment of overdosage is essentially symptomatic and supportive. Only in cases of extreme overdosage or individual sensitivity do vital signs, including respiration, pulse, blood pressure, temperature, and EKG, need to be monitored. Activated charcoal orally or by lavage may be given, or sodium or magnesium sulfate orally as a cathartic. Attention should be given to the reestablishment of adequate respiratory exchange through provision of a patent airway and institution of assisted or controlled ventilation. Diazepam may be used to control convulsions. Acidosis and electrolyte losses should be corrected. Note that any depressant effects of promethazine HCl are not reversed by naloxone. Avoid analeptics which may cause convulsions.
- The treatment of choice for resulting hypotension is administration of intravenous fluids, accompanied by repositioning if indicated. In the event that vasopressors are considered for the management of severe hypotension which does not respond to intravenous fluids and repositioning, the administration of norepinephrine or phenylephrine should be considered. EPINEPHRINE SHOULD NOT BE USED, since its use in patients with partial adrenergic blockade may further lower the blood pressure. Extrapyramidal reactions may be treated with anticholinergic antiparkinson agents, diphenhydramine, or barbiturates. Oxygen may also be administered.
- Limited experience with dialysis indicates that it is not helpful.
Pharmacology
Mechanism of Action
- Promethazine is a phenothiazine derivative which differs structurally from the antipsychotic phenothiazines by the presence of a branched side chain and no ring substitution. It is thought that this configuration is responsible for its relative lack (1/10 that of chlorpromazine) of dopamine antagonist properties.
- Promethazine is an H1 receptor blocking agent. In addition to its antihistaminic action, it provides clinically useful sedative and antiemetic effects.
Structure
- Each rectal suppository of Phenadoz contains 12.5 mg or 25 mg promethazine HCl with ascorbyl palmitate, colloidal silicon dioxide, white wax, and cocoa butter. Phenadoz Suppositories are for rectal administration only.
- Promethazine HCl is a racemic compound; the empirical formula is C17H20N2S•HCl and its molecular weight is 320.88.
- Promethazine HCl, a phenothiazine derivative, is designated chemically as 10H-Phenothiazine-10-ethanamine, N,N,α-trimethyl-, monohydrochloride,(±)- with the following structural formula:
This image is provided by the National Library of Medicine.
- Promethazine HCl occurs as a white to faint yellow, practically odorless, crystalline powder which slowly oxidizes and turns blue on prolonged exposure to air. It is soluble in water and freely soluble in alcohol.
Pharmacodynamics
- Promethazine is well absorbed from the gastrointestinal tract. Clinical effects are apparent within 20 minutes after oral administration and generally last four to six hours, although they may persist as long as 12 hours. Promethazine is metabolized by the liver to a variety of compounds; the sulfoxides of promethazine and N-demethylpromethazine are the predominant metabolites appearing in the urine.
Pharmacokinetics
There is limited information regarding Pharmacokinetics of Promethazine (rectal) in the drug label.
Nonclinical Toxicology
Carcinogenesis, Mutagenesis, Impairment of Fertility
- Long term animal studies have not been performed to assess the carcinogenic potential of promethazine, nor are there other animal or human data concerning carcinogenicity, mutagenicity, or impairment of fertility with this drug. Promethazine was nonmutagenic in the Salmonella test system of Ames.
Clinical Studies
There is limited information regarding Clinical Studies of Promethazine (rectal) in the drug label.
How Supplied
- Phenadoz® (promethazine HCl) Rectal Suppositories USP are available in boxes of 12 as follows:
- 12.5 mg, ivory, torpedo-shaped suppository contained in plastic packet, NDC 0574-7236-12.
- 25 mg, ivory, torpedo-shaped suppository contained in plastic packet, NDC 0574-7234-12.
- Store refrigerated between 2°C- 8°C (36°F- 46°F).
- Dispense in well-closed container.
Storage
There is limited information regarding Promethazine (rectal) Storage in the drug label.
Images
Drug Images
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Package and Label Display Panel
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Patient Counseling Information
- Phenadoz Suppositories may cause marked drowsiness or impair the mental and/or physical abilities required for the performance of potentially hazardous tasks, such as driving a vehicle or operating machinery. The use of alcohol or other central-nervous-system depressants such as sedatives/hypnotics (including barbiturates), narcotics, narcotic analgesics, general anesthetics, tricyclic antidepressants, and tranquilizers, may enhance impairment . Pediatric patients should be supervised to avoid potential harm in bike riding or in other hazardous activities.
- Patients should be advised to report any involuntary muscle movements.
- Avoid prolonged exposure to the sun.
Precautions with Alcohol
- Alcohol-Promethazine (rectal) interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.
Brand Names
There is limited information regarding Promethazine (rectal) Brand Names in the drug label.
Look-Alike Drug Names
There is limited information regarding Promethazine (rectal) Look-Alike Drug Names in the drug label.
Drug Shortage Status
Price
References
The contents of this FDA label are provided by the National Library of Medicine.
- ↑ 1.0 1.1 Strenkoski-Nix LC, Ermer J, DeCleene S, Cevallos W, Mayer PR (August 2000). "Pharmacokinetics of promethazine hydrochloride after administration of rectal suppositories and oral syrup to healthy subjects". American Journal of Health-system Pharmacy : AJHP : Official Journal of the American Society of Health-System Pharmacists. 57 (16): 1499–505. PMID 10965395.
- ↑ Paton DM, Webster DR (1985). "Clinical pharmacokinetics of H1-receptor antagonists (the antihistamines)". Clinical Pharmacokinetics. 10 (6): 477–97. doi:10.2165/00003088-198510060-00002. PMID 2866055.
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