Promethazine (oral)
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Vignesh Ponnusamy, M.B.B.S. [2]
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Black Box Warning
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WARNING
See full prescribing information for complete Boxed Warning.
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Overview
Promethazine (oral) is a phenothiazine derivative that is FDA approved for the {{{indicationType}}} of perennial and seasonal allergic rhinitis, vasomotor rhinitis, allergic conjunctivitis, mild, uncomplicated allergic skin manifestations of urticaria and angiodema, amelioration of allergic reactions to blood or plasma, dermographism, preoperative, postoperative, or obstetric sedation, prevention and control of nausea and vomiting associated with certain types of anesthesia and surgery, adjunctive to meperidine or other analgesics for control of postoperative pain, motion sickness, antiemetic therapy in postoperative patients. 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)
Allergy
- The average oral 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 adults, dosage should be adjusted to the smallest amount adequate to relieve symptoms. The administration of promethazine HCl 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 eight to twelve 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.
Nausea and Vomiting
- The average effective dose of promethazine HCl for the active therapy of nausea and vomiting in adults is 25 mg. When oral medication cannot be tolerated, the dose should be given parenterally (promethazine injection) or by rectal suppository. 12.5 mg to 25 mg doses may be repeated, as necessary, at four-to six-hour intervals.
- For prophylaxis of nausea and vomiting, as during surgery and the postoperative period, the average dose is 25 mg repeated at four-to six-hour intervals, as necessary.
Sedation
- This product relieves apprehension and induces a quiet sleep from which the patient can be easily aroused. Adults usually require 25 to 50 mg for nighttime, presurgical, or obstetrical sedation.
Pre- and Postoperative Use
- Promethazine HCl 50 mg doses for adults the night before surgery relieves apprehension and produces a quiet sleep.
- Usual adult dosage is 50 mg promethazine HCl 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 25 to 50 mg doses in adults.
Off-Label Use and Dosage (Adult)
Guideline-Supported Use
There is limited information regarding Off-Label Guideline-Supported Use of Promethazine in adult patients.
Non–Guideline-Supported Use
There is limited information regarding Off-Label Non–Guideline-Supported Use of Promethazine in adult patients.
Pediatric Indications and Dosage
FDA-Labeled Indications and Dosage (Pediatric)
Allergy
- The average oral 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, dosage should be adjusted to the smallest amount adequate to relieve symptoms. The administration of promethazine HCl in 25 mg doses will control minor transfusion reactions of an allergic nature.
Motion Sickness
- For children, promethazine hydrochloride tablets 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 promethazine HCl for the active therapy of nausea and vomiting in children is 25 mg. When oral medication cannot be tolerated, the dose should be given parenterally (promethazine injection) or by rectal suppository. 12.5 mg to 25 mg doses may be repeated, as necessary, at four-to six-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 four-to six-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 promethazine HCl by the oral route or by rectal suppository at bedtime will provide sedation in children.
Pre- and Postoperative Use
- Promethazine HCl in 12.5 to 25 mg doses for children 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.
- Postoperative sedation and adjunctive use with analgesics may be obtained by the administration of 12.5 to 25 mg in children.
- Promethazine hydrochloride tablets are contraindicated for children under 2 years of age.
Off-Label Use and Dosage (Pediatric)
Guideline-Supported Use
There is limited information regarding Off-Label Guideline-Supported Use of Promethazine in pediatric patients.
Non–Guideline-Supported Use
There is limited information regarding Off-Label Non–Guideline-Supported Use of Promethazine in pediatric patients.
Contraindications
- Promethazine hydrochloride tablets are contraindicated for use in pediatric patients less than two years of age.
- Promethazine hydrochloride tablets 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.
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- CNS Depression
- Promethazine HCl tablets 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
- Promethazine HCl tablets may lead to potentially fatal respiratory depression.
- Use of promethazine HCl tablets in patients with compromised respiratory function (e.g., COPD, sleep apnea) should be avoided.
- Lower Seizure Threshold
- Promethazine HCl tablets 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
- Promethazine HCl tablets 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 tablets are contraindicated for the use in pediatric patients less than two years of age.
- Caution should be exercised when administering promethazine hcl tablets 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 are not directly related to individualized weight-based dosing, which might otherwise permit safe administration, 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 tablets administration may be confused with the CNS signs of undiagnosed primary disease, e.g., encephalopathy or Reye's syndrome. The use of promethazine hcl tablets 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 promethazine HCl tablets in pediatric patients may cause sudden death. 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.
- Promethazine HCl tablets 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).
Other
Angioneurotic edema. Neuroleptic malignant syndrome (potentially fatal) has also been reported.
Paradoxical Reactions
Hyperexcitability and abnormal movements have been reported in 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 in the drug label.
Drug Interactions
- CNS Depressants
- Promethazine HCl tablets 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 promethazine HCl tablets, 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.
- Because of the potential for promethazine HCl to reverse epinephrine's vasopressor effect, epinephrine should NOT be used to treat hypotension associated with promethazine HCl tablets 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 promethazine HCl tablets.
Use in Specific Populations
Pregnancy
- Pregnancy Category C
- Teratogenic effects have not been demonstrated in rat-feeding studies at doses of 6.25 mg/kg 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 promethazine in pregnant women.
- Promethazine HCl tablets should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
- Nonteratogenic Effects:
- Promethazine administered to a pregnant women within two weeks of delivery may inhibit platelet aggregation in the newborn.
- Australian Drug Evaluation Committee (ADEC) Pregnancy Category
There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Promethazine in women who are pregnant.
Labor and Delivery
- Promethazine HCl may be used alone or as an adjunct to narcotic analgesics during labor. 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 the potential for serious adverse reactions in nursing infants from promethazine HCl tablets 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
- Promethazine HCl tablets should be used with caution in pediatric patients 2 years of age and older.
Geriatic Use
- Clinical studies of promethazine HCl formulations 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 over-sedation in the elderly; elderly patients generally should be started on low doses of promethazine HCl tablets and observed closely.
Gender
There is no FDA guidance on the use of Promethazine with respect to specific gender populations.
Race
There is no FDA guidance on the use of Promethazine with respect to specific racial populations.
Renal Impairment
There is no FDA guidance on the use of Promethazine in patients with renal impairment.
Hepatic Impairment
There is no FDA guidance on the use of Promethazine in patients with hepatic impairment.
Females of Reproductive Potential and Males
There is no FDA guidance on the use of Promethazine in women of reproductive potentials and males.
Immunocompromised Patients
There is no FDA guidance one the use of Promethazine in patients who are immunocompromised.
Administration and Monitoring
Administration
- Oral
- Intravenous
- Intramuscular
Monitoring
There is limited information regarding Monitoring of Promethazine in the drug label.
IV Compatibility
There is limited information regarding IV Compatibility of Promethazine in the drug label.
Overdosage
Acute Overdose
Signs and Symptoms
- 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, and 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.
Management
- 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.
Chronic Overdose
There is limited information regarding Chronic Overdose of Promethazine in the drug label.
Pharmacology
Mechanism of Action
- Promethazine is an H1 receptor blocking agent. In addition to its antihistaminic action, it provides clinically useful sedative and antiemetic effects.
Structure
- Promethazine hydrochloride, 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 hydrochloride is a racemic compound; the molecular formula is C17H20N2S • HCl and its molecular weight is 320.88.
- Promethazine hydrochloride occurs as a white to faint yellow, practically odorless, crystalline powder which slowly oxidizes and turns blue on prolonged exposure to air. It is freely soluble in water and soluble in alcohol.
- Each tablet for oral administration contains 12.5 mg, 25 mg or 50 mg promethazine hydrochloride, USP. The inactive ingredients include: hypromellose, lactose monohydrate, magnesium stearate, and microcrystalline cellulose. The 12.5 mg contains FD&C Yellow No.6 aluminum lake. The 50 mg contains D&C Red Lake Blend No.27 aluminum lake and D & C Red No. 30 aluminum lake.
Pharmacodynamics
- 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.
Pharmacokinetics
- 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.
Nonclinical Toxicology
- 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 in the drug label.
How Supplied
- Promethazine hydrochloride tablets, USP contains 12.5 mg, 25 mg or 50 mg as promethazine hydrochloride, USP and are supplied as follows:
- 12.5 mg: Light peach, round, biconvex, uncoated tablets, debossed “107” on one side and scored on the other side.
- NDC 57664-107-83 Bottles of 30 CRC
- NDC 57664-107-88 Bottles of 100 CRC
- NDC 57664-107-08 Bottles of 100
- NDC 57664-107-13 Bottles of 500
- NDC 57664-107-18 Bottles of 1000
- 12.5 mg: Light peach, round, biconvex, uncoated tablets, debossed “107” on one side and scored on the other side.
- 25 mg: White to off-white, round, flat face bevel edge, uncoated tablets, debossed “108” on one side and scored on the other side.
- NDC 57664-108-83 Bottles of 30 CRC
- NDC 57664-108-88 Bottles of 100 CRC
- NDC 57664-108-08 Bottles of 100
- NDC 57664-108-13 Bottles of 500
- NDC 57664-108-18 Bottles of 1000
- 25 mg: White to off-white, round, flat face bevel edge, uncoated tablets, debossed “108” on one side and scored on the other side.
- 50 mg: Light pink, round, biconvex, uncoated tablets, debossed “109” on one side and plain on the other side.
- NDC 57664-109-83 Bottles of 30 CRC
- NDC 57664-109-88 Bottles of 100 CRC
- NDC 57664-109-08 Bottles of 100
- NDC 57664-109-13 Bottles of 500
- NDC 57664-109-18 Bottles of 1000
- 50 mg: Light pink, round, biconvex, uncoated tablets, debossed “109” on one side and plain on the other side.
- Store at 20° - 25°C (68° - 77°F).
- Dispense in tight, light-resistant container.
Storage
There is limited information regarding Promethazine (oral) Storage in the drug label.
Images
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Package and Label Display Panel
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Patient Counseling Information
- Promethazine HCl tablets 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.
This image is provided by the National Library of Medicine.
Precautions with Alcohol
- Alcohol-Promethazine interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.
Brand Names
- PROMETHAZINE®[3]
Look-Alike Drug Names
There is limited information regarding Promethazine (oral) 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.
- ↑ "PROMETHAZINE HYDROCHLORIDE promethazine hydrochloride tablet".
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