![GUAIFENESIN TABLET [CONTRACT PHARMACY SERVICES-PA]](https://medic.hrt.org//dailymed/images/78987a51-82f7-4ca6-80ad-fa22d1f3e11a/78987a51-82f7-4ca6-80ad-fa22d1f3e11a-01.jpg)
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DESCRIPTION
Guaifenesin (glyceryl guaiacolate) has the chemical name 3-(2-methoxyphenoxy)-1,2-propanediol. Its molecular formula is C10H14O4 with a molecular weight of 198.21. It is a white or slightly gray crystalline substance with a slightly bitter aromatic taste. One gram dissolves in 20 mL water at 25°C; it is freely soluble in ethanol. Guaifenesin is readily absorbed from the GI tract and is rapidly metabolized and excreted in the urine. Guaifenesin has a plasma half-life of one hour. The major urinary metabolite is β-(2-methoxyphenoxy) lactic acid.
Guaifenesin is an expectorant available for oral administration as:
Tablets — each containing 200 mg guaifenesin, USP.
Other ingredients: crospovidone, D&C red #30 aluminum lake, magnesium stearate, microcrystalline cellulose, polysaccharides, pregelatinized starch, silicon dioxide, sodium starch glycolate, and stearic acid.
- CLINICAL PHARMACOLOGY
- INDICATIONS AND USAGE
- CONTRAINDICATIONS
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PRECAUTIONS
Carcinogenesis, Mutagenesis, Impairment of Fertility: Animal studies to assess the long-term carcinogenic and mutagenic potential or the effect on fertility in animals or humans have not been performed.
Pregnancy:
Teratogenic Effects—Pregnancy Category C: Animal reproduction studies have not been conducted. Safe use in pregnancy has not been established relative to possible adverse effects on fetal development. Therefore, these products should not be used in pregnant patients unless, in the judgment of the physician, the potential benefits outweigh possible hazards.
Nursing Mothers: It is not known whether guaifenesin is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when these products are administered to a nursing woman and 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.
Laboratory Test Interactions: Guaifenesin or its metabolites may cause color interference with the VMA (vanillylmandelic acid) test for catechols. It may also falsely elevate the level of urinary 5-HIAA (5-hydroxyindoleacetic acid) in certain serotonin metabolite chemical tests because of color interference.
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ADVERSE REACTIONS
To report SUSPECTED ADVERSE REACTIONS, contact FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
Guaifenesin is well tolerated and has a wide margin of safety. Side effects have been generally mild and infrequent. Nausea and vomiting are the side effects that occur most commonly. Dizziness, headache, and rash (including urticaria) have been reported rarely.
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OVERDOSAGE
In massive overdosage the stomach should be emptied (emesis and/or gastric lavage) and further absorption prevented. Treatment is symptomatic and supportive.
The acute toxicity of guaifenesin is low and overdosage is unlikely to produce serious toxic effects. In laboratory animals no toxicity resulted when guaifenesin was administered by stomach tube in doses up to 5 grams/kg.
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DOSAGE AND ADMINISTRATION
Adults and children 12 years of age and older: One to 2 tablets (200 mg to 400 mg) every four hours, not to exceed 2400 mg (12 tablets) in 24 hours.
PATIENTS SHOULD BE ADVISED TO KEEP THESE AND ALL DRUGS OUT OF THE REACH OF CHILDREN AND TO SEEK PROFESSIONAL ASSISTANCE OR CONTACT A POISON CONTROL CENTER IMMEDIATELY IN CASE OF ACCIDENTAL OVERDOSE.
- HOW SUPPLIED
- PRINCIPAL DISPLAY PANEL
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INGREDIENTS AND APPEARANCE
GUAIFENESIN
guaifenesin tabletProduct Information Product Type HUMAN PRESCRIPTION DRUG Item Code (Source) NDC:67046-250(NDC:0603-4886) Route of Administration ORAL Active Ingredient/Active Moiety Ingredient Name Basis of Strength Strength GUAIFENESIN (UNII: 495W7451VQ) (GUAIFENESIN - UNII:495W7451VQ) GUAIFENESIN 200 mg Inactive Ingredients Ingredient Name Strength CROSPOVIDONE (UNII: 68401960MK) D&C RED NO. 30 (UNII: 2S42T2808B) MAGNESIUM STEARATE (UNII: 70097M6I30) CELLULOSE, MICROCRYSTALLINE (UNII: OP1R32D61U) SILICON DIOXIDE (UNII: ETJ7Z6XBU4) SODIUM STARCH GLYCOLATE TYPE A POTATO (UNII: 5856J3G2A2) STEARIC ACID (UNII: 4ELV7Z65AP) Product Characteristics Color PINK Score 2 pieces Shape ROUND Size 10mm Flavor Imprint Code 4740;V Contains Packaging # Item Code Package Description Marketing Start Date Marketing End Date 1 NDC:67046-250-30 30 in 1 BLISTER PACK Marketing Information Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date Unapproved drug other 10/06/2010 Labeler - Contract Pharmacy Services-PA (945429777)
