Label: LORZONE- chlorzoxazone tablet

  • NDC Code(s): 68025-046-01, 68025-046-02, 68025-046-10, 68025-047-01, view more
    68025-047-02, 68025-047-10
  • Packager: Vertical Pharmaceuticals, Inc.
  • Category: HUMAN PRESCRIPTION DRUG LABEL
  • DEA Schedule: None
  • Marketing Status: Abbreviated New Drug Application

Drug Label Information

Updated 10/11

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  • SPL UNCLASSIFIED SECTION

    For Painful Musculoskeletal Conditions

    PRESCRIBING INFORMATION

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  • DESCRIPTION

    Each 375 mg Lorzone™ tablet contains: chlorzoxazone USP 375 mg.

    Each 750 mg Lorzone™ tablet contains: chlorzoxazone USP 750 mg.

    Chemical Name: 5-Chloro-2-benzoxazolinone.

    Structural Formula:

    chlorzoxazone chemical structure

    Molecular Formula: C7H4CINO2

    Molecular Weight: 169.56

    Chlorzoxazone USP is a white or practically white, practically odorless, crystalline powder. Chlorzoxazone is slightly soluble in water; sparingly soluble in alcohol, in isopropyl alcohol, and in methanol; soluble in solutions of alkali hydroxides and ammonia.

    Inactive ingredients: anhydrous lactose, croscarmellose sodium, docusate sodium, magnesium stearate, microcrystalline cellulose, pregelatinized corn starch and sodium benzoate.

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  • CLINICAL PHARMACOLOGY

    Chlorzoxazone is a centrally-acting agent for painful musculoskeletal conditions. Data available from animal experiments as well as human study indicate that chlorzoxazone acts primarily at the level of the spinal cord and subcortical areas of the brain where it inhibits multisynaptic reflex arcs involved in producing and maintaining skeletal muscle spasm of varied etiology. The clinical result is a reduction of the skeletal muscle spasm with relief of pain and increased mobility of the involved muscles. Blood levels of chlorzoxazone can be detected in people during the first 30 minutes and peak levels may be reached, in the majority of the subjects, in about 1 to 2 hours after oral administration of chlorzoxazone. Chlorzoxazone is rapidly metabolized and is excreted in the urine, primarily in a conjugated form as the glucuronide. Less than one percent of a dose of chlorzoxazone is excreted unchanged in the urine in 24 hours.

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  • INDICATIONS AND USAGE

    Lorzone™ is indicated as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute, painful musculoskeletal conditions. The mode of action of this drug has not been clearly identified, but may be related to its sedative properties. Chlorzoxazone does not directly relax tense skeletal muscles in man.

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  • CONTRAINDICATIONS

    Lorzone™ is contraindicated in patients with known intolerance to the drug.

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  • WARNINGS

    Serious (including fatal) hepatocellular toxicity has been reported rarely in patients receiving chlorzoxazone. The mechanism is unknown but appears to be idiosyncratic and unpredictable. Factors predisposing patients to this rare event are not known. Patients should be instructed to report early signs and/ or symptoms of hepatoxicity such as fever, rash, anorexia, nausea, vomiting, fatigue, right upper quadrant pain, dark urine, or jaundice. Lorzone™ should be discontinued immediately and a physician consulted if any of these signs or symptoms develop. Lorzone™ use should also be discontinued if a patient develops abnormal liver enzymes (e.g., AST, ALT, alkaline phosphates and bilirubin).

    The concomitant use of alcohol or other central nervous system depressants may have an additive effect.

    Usage in Pregnancy: The safe use of Lorzone™ has not been established with respect to the possible adverse effects upon fetal development. Therefore, it should be used in women of childbearing potential only when, in the judgement of the physician, the potential benefits outweigh the possible risks.

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  • PRECAUTIONS

    Lorzone™ should be used with caution in patients with known allergies or with a history of allergic reactions to drugs. If sensitivity reaction occurs such urticaria, redness, or itching of the skin, the drug should be stopped.

    If any symptoms suggestive of liver dysfunction are observed, the drug should be discontinued.

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  • ADVERSE REACTIONS

    Chlorzoxazone-containing products are usually well tolerated. It is possible in rare instances that chlorzoxazone may have been associated with gastrointestinal bleeding. Drowsiness, dizziness, light- headedness, malaise, or overstimulation may be noted by an occasional patient. Rarely, allergic-type skin rashes, petechiae, or ecchymoses may develop during treatment. Angioneurotic edema or anaphylactic reactions are extremely rare. There is no evidence that the drug will cause renal damage. Rarely, a patient may note discoloration of the urine resulting from a phenolic metabolite of chlorzoxazone. This finding is of no known clinical significance.

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  • OVERDOSAGE

    Symptoms: Initially, gastrointestinal disturbances such a nausea, vomiting, or diarrhea together with drowsiness, dizziness, lightheadedness or headache may occur. Early in the course there may be malaise or sluggishness followed by marked loss of muscle tone, making voluntary movement impossible. The deep tendon reflexes may be decreased or absent. The sensorium remains intact, and there is no peripheral loss of sensation. Respiratory depression may occur with rapid, irregular respiration and intercostals and substernal retraction. The blood pressure is lowered, but shock has not been observed.

    Treatment: Gastric lavage or induction of emesis should be carried out, followed by administration of activated charcoal. Thereafter, treatment is entirely supportive. If respirations are depressed, oxygen and artificial respiration should be employed and a patent airway assured by use of an oropharyngeal airway or endotracheal tube. Hypotension may be counteracted by use of dextran, plasma, concentrated albumin or a vasopressor agent such as norepinephrine. Cholinergic drugs or analeptic drugs are of no value and should not be used.

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  • DOSAGE AND ADMINISTRATION

    Usual Adult Dosage

    Lorzone™ Tablets (chlorzoxazone USP) 375 mg:

    One tablet three or four times daily. If adequate response is not obtained with this dose, the 375 mg tablets may be increased to two tablets (750 mg) three or four times daily. As improvement occurs dosage can usually be reduced.

    Lorzone™ Tablets (chlorzoxazone USP) 750 mg:

    2/3 tablet (500 mg) three or four times daily. If adequate response is not obtained with this dose, it may be increased to one tablet (750 mg) three or four times daily. As improvement occurs dosage can usually be reduced.

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  • HOW SUPPLIED

    Lorzone™  Tablets (chlorzoxazone USP) is supplied as follows:

    375 mg

    A white capsule shaped tablet, debossed “ADG” on one side and “375” on the other side, in bottles of 100 tablets, NDC 68025-046-10.

    750 mg

    A white capsule shaped tablet, debossed “ADG” on the trisected side and “750” on the bisected side, in bottles of 100 tablets, NDC 68025-047-10.

    Dispense in tight container as defined in the official compendium.

    Store at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature].

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  • SPL UNCLASSIFIED SECTION

    Manufactured for:

    Vertical Pharmaceuticals, Inc.

    Sayreville, NJ 08872

    Code 1015B00

    Rev. 10/10

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  • PRINCIPAL DISPLAY PANEL - 375 mg
  • PRINCIPAL DISPLAY PANEL - 750 MG
  • INGREDIENTS AND APPEARANCE
    LORZONE 
    chlorzoxazone tablet
    Product Information
    Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:68025-046
    Route of Administration ORAL DEA Schedule     
    Active Ingredient/Active Moiety
    Ingredient Name Basis of Strength Strength
    CHLORZOXAZONE (CHLORZOXAZONE) CHLORZOXAZONE 375 mg
    Inactive Ingredients
    Ingredient Name Strength
    ANHYDROUS LACTOSE  
    CELLULOSE, MICROCRYSTALLINE  
    CROSCARMELLOSE SODIUM  
    DOCUSATE SODIUM  
    MAGNESIUM STEARATE  
    SODIUM BENZOATE  
    STARCH, CORN  
    Product Characteristics
    Color WHITE Score no score
    Shape OVAL (CAPSULE-SHAPED) Size 17mm
    Flavor Imprint Code ADG;375
    Contains     
    Packaging
    # Item Code Package Description Marketing Start Date Marketing End Date
    1 NDC:68025-046-10 100 in 1 BOTTLE, PLASTIC
    2 NDC:68025-046-02 2 in 1 BOX, UNIT-DOSE
    2 NDC:68025-046-01 1 in 1 POUCH
    Marketing Information
    Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
    ANDA ANDA040861 10/01/2011
    LORZONE 
    chlorzoxazone tablet
    Product Information
    Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:68025-047
    Route of Administration ORAL DEA Schedule     
    Active Ingredient/Active Moiety
    Ingredient Name Basis of Strength Strength
    CHLORZOXAZONE (CHLORZOXAZONE) CHLORZOXAZONE 750 mg
    Inactive Ingredients
    Ingredient Name Strength
    ANHYDROUS LACTOSE  
    CELLULOSE, MICROCRYSTALLINE  
    CROSCARMELLOSE SODIUM  
    DOCUSATE SODIUM  
    MAGNESIUM STEARATE  
    SODIUM BENZOATE  
    STARCH, CORN  
    Product Characteristics
    Color WHITE Score 3 pieces
    Shape OVAL (CAPSULE-SHAPED) Size 20mm
    Flavor Imprint Code ADG;750
    Contains     
    Packaging
    # Item Code Package Description Marketing Start Date Marketing End Date
    1 NDC:68025-047-10 100 in 1 BOTTLE, PLASTIC
    2 NDC:68025-047-02 2 in 1 BOX, UNIT-DOSE
    2 NDC:68025-047-01 1 in 1 POUCH
    Marketing Information
    Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
    ANDA ANDA040861 10/01/2011
    Labeler - Vertical Pharmaceuticals, Inc. (173169017)
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