Guaifenesin and Potassium Guaiacolsulfonate


(gwye FEN e sin & poe TASS ee um gwye a kole SUL foe nate)

U.S. Brand Names

Allfen ; Humibid® LA



Potassium Guaiacolsulfonate and Guaifenesin

Generic Available



Temporary control of cough associated with respiratory tract infections and related conditions which are complicated by tenacious mucus and/or mucus plugs and congestion

Pregnancy Risk Factor


Pregnancy Implications

Reproduction studies have not been conducted.


Excretion in breast milk unknown/not recommended


Hypersensitivity to guaifenesin, potassium guaiacolsulfonate, or any component of the formulation


Underlying cause of cough should be determined prior to prescribing. Safety and efficacy have not been established in children <6 years of age.

Adverse Reactions

Frequency not defined.

Central nervous system: Dizziness, headache

Dermatologic: Rash, urticaria

Endocrine & metabolic: Uric acid levels decreased

Gastrointestinal: Gastrointestinal discomfort, nausea, vomiting

Postmarketing and/or case reports: Kidney stone formation (with consumption of large quantities of guaifenesin)


Store at room temperature of 20°C to 25°C (68°F to 77°F), in a dry location.

Mechanism of Action

Guaifenesin and potassium guaiacolsulfonate are both expectorants. Guaifenesin is thought to act as an expectorant by irritating the gastric mucosa and stimulating respiratory tract secretions, thereby increasing respiratory fluid volumes and decreasing mucus viscosity.


Absorption: Guaifenesin: Well absorbed

Half-life elimination: Guaifenesin: ~1 hour

Excretion: Guaifenesin: Urine (as unchanged drug and metabolites)


Oral: Relief of cough:

Children 6-12 years (Allfen): One-half tablet every 12 hours; maximum 1 tablet/24 hours


12 years and Adults (Allfen, Humibid® LA): One tablet every 12 hours; maximum 2 tablets/24 hours


Extended release tablets should not be crushed or chewed.

Test Interactions

Possible interference with determination of 5-HIAA and VMA; discontinue for 48 hours prior to test.

Dental Health: Effects on Dental Treatment

No significant effects or complications reported

Dental Health: Vasoconstrictor/Local Anesthetic Precautions

No information available to require special precautions

Mental Health: Effects on Mental Status

May cause dizziness or drowsiness

Mental Health: Effects on Psychiatric Treatment

None reported

Dosage Forms

Tablet, sustained release:

Allfen: Guaifenesin 1000 mg and potassium guaiacolsulfonate 150 mg

Humibid® LA: Guaifenesin 600 mg and potassium guaiacolsulfonate 300 mg

Review Date: 1969-12-31 Reviewed By: Keywords: ,
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