Label: DIPHENHYDRAMINE HYDROCHLORIDE injection, solution

  • Category: HUMAN PRESCRIPTION DRUG LABEL
  • DEA Schedule: None
  • Marketing Status: Abbreviated New Drug Application

Drug Label Information

Updated February 26, 2021

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  • DESCRIPTION

    Diphenhydramine Hydrochloride Injection is a sterile, nonpyrogenic solution for intravenous or deep intramuscular use as an antihistaminic agent. Each mL contains diphenhydramine hydrochloride 50 mg and benzethonium chloride 100 mcg in Water for Injection. pH 4.0-6.5; sodium hydroxide and/or hydrochloric acid added, if needed, for pH adjustment.

    The chemical name of diphenhydramine hydrochloride is 2-(Diphenylmethoxy)-N,N-dimethylethylamine hydrochloride. The structural formula is as follows:

    Formula1

    C17H21NO • HCl MW 291.82

    Diphenhydramine hydrochloride occurs as a white crystalline powder and is freely soluble in water and alcohol.

  • CLINICAL PHARMACOLOGY

    Diphenhydramine hydrochloride is an antihistamine with anticholinergic (drying) and sedative side effects. Antihistamines appear to compete with histamine for cell receptor sites on effector cells.

    Diphenhydramine hydrochloride in the injectable form has a rapid onset of action. Diphenhydramine is widely distributed throughout the body, including the CNS. A portion of the drug is excreted unchanged in the urine, while the rest is metabolized via the liver. Detailed information on the pharmacokinetics of Diphenhydramine Hydrochloride Injection is not available.

  • INDICATIONS AND USAGE

    Diphenhydramine Hydrochloride Injection is effective in adults and pediatric patients, other than premature infants and neonates, for the following conditions when the oral form is impractical:

    Antihistaminic-For amelioration of allergic reactions to blood or plasma, in anaphylaxis as an adjunct to epinephrine and other standard measures after the acute symptoms have been controlled and for other uncomplicated allergic conditions of the immediate type when oral therapy is impossible or contraindicated.

    Motion Sickness-For active treatment of motion sickness.

    Antiparkinsonism-For use in parkinsonism, when oral therapy is impossible or contraindicated, as follows:  parkinsonism in the elderly who are unable to tolerate more potent agents, mild cases at parkinsonism in other age groups and in other cases of parkinsonism in combination with centrally acting anticholinergic agents.

  • CONTRAINDICATIONS

    USE IN NEONATES OR PREMATURE INFANTS

    This drug should not be used in neonates or premature infants.

    USE IN NURSING MOTHERS

    Because of the higher risk of antihistamines for infants generally, and for neonates and prematures in particular, antihistamine therapy is contraindicated in nursing mothers.

    USE AS A LOCAL ANESTHETIC

    Because of the risk of local necrosis, this drug should not be used as a local anesthetic.

    ANTIHISTAMINES ARE ALSO CONTRAINDICATED IN THE FOLLOWING CONDITIONS

    Hypersensitivity to diphenhydramine hydrochloride and other antihistamines of similar chemical structure.

  • WARNINGS

    Antihistamines should be used with considerable caution in patients with narrow-angle glaucoma, stenosing peptic ulcer, pyloroduodenal obstruction, symptomatic prostatic hypertrophy or bladder-neck obstruction.

    Local necrosis has been associated with the use of subcutaneous or intradermal use of intravenous diphenhydramine.

    USE IN PEDIATRIC PATIENTS

    In pediatric patients, especially, antihistamines in overdosage may cause hallucinations, convulsions or death.

    As in adults, antihistamines may diminish mental alertness in pediatric patients. In the young pediatric patient, particularly, they may produce excitation.

    USE IN THE ELDERLY (approximately 60 years or older)

    Antihistamines are more likely to cause dizziness, sedation and hypotension in elderly patients.

  • PRECAUTIONS

    GENERAL

    Diphenhydramine hydrochloride has an atropine-like action and, therefore, should be used with caution in patients with a history of bronchial asthma, increased intraocular pressure, hyperthyroidism, cardiovascular disease or hypertension. Use with caution in patients with lower respiratory disease, including asthma.

    INFORMATION FOR PATIENTS

    Patients taking diphenhydramine hydrochloride should be advised that this drug may cause drowsiness and has an additive effect with alcohol.

    Patients should be warned about engaging in activities requiring mental alertness, such as driving a car or operating appliances, machinery, etc.

    DRUG INTERACTIONS

    Diphenhydramine hydrochloride has additive effects with alcohol and other CNS depressants (hypnotics, sedatives, tranquilizers, etc.).

    MAO inhibitors prolong and intensify the anticholinergic (drying) effects of antihistamines.

    CARCINOGENESIS, MUTAGENESIS, IMPAIRMENT OF FERTILITY

    Long-term studies in animals to determine mutagenic and carcinogenic potential have not been performed.

    PREGNANCY

    TERATOGENIC EFFECTS-PREGNANCY CATEGORY B. Reproduction studies have been performed in rats and rabbits at doses up to 5 times the human dose and have revealed no evidence of impaired fertility or harm to the fetus due to diphenhydramine hydrochloride. There are, however, no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.

    PEDIATRIC USE

    Diphenhydramine should not be used in neonates and premature infants (see CONTRAINDICATIONS).

    Diphenhydramine may diminish mental alertness, or in the young pediatric patient, cause excitation. Overdosage may cause hallucinations, convulsions or death (see WARNINGS and OVERDOSAGE).

    See also DOSAGE AND ADMINISTRATION section.

  • ADVERSE REACTIONS

    The most frequent adverse reactions are italicized.

    GENERAL

    Urticaria; drug rash; anaphylactic shock; photosensitivity; excessive perspiration; chills; dryness of mouth, nose and throat.

    CARDIOVASCULAR SYSTEM

    Hypotension, headache, palpitations, tachycardia, extrasystoles.

    HEMATOLOGIC SYSTEM

    Hemolytic anemia, thrombocytopenia, agranulocytosis.

    NERVOUS SYSTEM

    Sedation, sleepiness, dizziness, disturbed coordination, fatigue, confusion, restlessness, excitation, nervousness, tremor, irritability, insomnia, euphoria, paresthesia, blurred vision, diplopia, vertigo, tinnitus, acute labyrinthitis, neuritis, convulsions.

    GASTROINTESTINAL SYSTEM

    Epigastric distress, anorexia, nausea, vomiting, diarrhea, constipation.

    GENITOURINARY SYSTEM

    Urinary frequency, difficult urination, urinary retention, early menses.

    RESPIRATORY SYSTEM

    Thickening of bronchial secretions, tightness of chest and wheezing, nasal stuffiness.

  • OVERDOSAGE

    Antihistamine overdosage reactions may vary from central nervous system depression to stimulation. Stimulation is particularly likely in pediatric patients. Atropine-like signs and symptoms, dry mouth; fixed, dilated pupils; flushing and gastrointestinal symptoms may also occur.

    Stimulants should not be used.

    Vasopressors may be used to treat hypotension.

  • DOSAGE AND ADMINISTRATION

    THIS PRODUCT IS FOR INTRAVENOUS OR INTRAMUSCULAR ADMINISTRATION ONLY.

    Diphenhydramine Hydrochloride Injection is indicated when the oral form is impractical.

    DOSAGE SHOULD BE INDIVIDUALIZED ACCORDING TO THE NEEDS AND THE RESPONSE OF THE PATIENT

    PEDIATRIC PATIENTS, OTHER THAN PREMATURE INFANTS AND NEONATES

    5 mg/kg/24 hours or 150 mg/m/24 hours. Maximum daily dosage is 300 mg. Divide into four doses, administered intravenously at a rate generally not exceeding 25 mg/min, or deep intramuscularly.

    ADULTS

    10 to 50 mg intravenously at a rate generally not exceeding 25 mg/min, or deep intramuscularly; 100 mg if required; maximum daily dosage is 400 mg.

    Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit.

  • HOW SUPPLIED

    Diphenhydramine Hydrochloride Injection, USP 50 mg/mL

    1 mL vials packaged in 25s (NDC 0641-0376-25)

    STORAGE

    Protect from light. Keep covered in carton until time of use. Store at 20°-25°C (68°-77°F), excursions permitted to 15°-30°C (59°-86°F) [See USP Controlled Room Temperature].

    To report SUSPECTED ADVERSE REACTIONS, contact Hikma Pharmaceuticals USA Inc. at 1-877-845-0689, or the FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

    For Product Inquiry call 1-877-845-0689.

    Manufactured by:

    Hikma Pharmaceuticals USA Inc.

    Berkeley Heights, NJ 07922

    Revised December 2019

    462-220-02

  • Sample Package Label

    Label1.jpg

  • INGREDIENTS AND APPEARANCE
    DIPHENHYDRAMINE HYDROCHLORIDE 
    diphenhydramine hydrochloride injection, solution
    Product Information
    Product TypeHUMAN PRESCRIPTION DRUGItem Code (Source)NDC:52584-376(NDC:0641-0376)
    Route of AdministrationINTRAVENOUS, INTRAMUSCULAR
    Active Ingredient/Active Moiety
    Ingredient NameBasis of StrengthStrength
    Diphenhydramine Hydrochloride (UNII: TC2D6JAD40) (Diphenhydramine - UNII:8GTS82S83M) Diphenhydramine Hydrochloride50 mg  in 1 mL
    Inactive Ingredients
    Ingredient NameStrength
    benzethonium chloride (UNII: PH41D05744) 100 ug  in 1 mL
    WATER (UNII: 059QF0KO0R)  
    SODIUM HYDROXIDE (UNII: 55X04QC32I)  
    HYDROCHLORIC ACID (UNII: QTT17582CB)  
    Packaging
    #Item CodePackage DescriptionMarketing Start DateMarketing End Date
    1NDC:52584-376-211 in 1 BAG07/01/2010
    11 mL in 1 VIAL, SINGLE-DOSE; Type 0: Not a Combination Product
    Marketing Information
    Marketing CategoryApplication Number or Monograph CitationMarketing Start DateMarketing End Date
    ANDAANDA08081707/01/2010
    Labeler - General Injectables & Vaccines, Inc (108250663)