Data Source: Information sourced from the FDA OpenFDA database. Database last updated: March 2026. Learn more about our data sources →
Drug Pricing — Cost Plus Drugs
Guaifenesin
400mg · Tablet
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Uses & Indications
Uses helps loosen phlegm (mucus) and thin bronchial secretions to rid the bronchial passageways of bothersome mucus and make coughs more productive
Dosage & Administration
Directions do not crush, chew, or break tablet take with a full glass of water this product can be administered without regard for the timing of meals adults and children 12 years of age and over: 1 or 2 tablets every 12 hours. Do not exceed 4 tablets in 24 hours. children under 12 years of age: do not use
Side Effects
No adverse reactions listed in FDA label.
Warnings & Precautions
Warnings Do not use for children under 12 years of age Ask a doctor before use if you have persistent or chronic cough such as occurs with smoking, asthma, chronic bronchitis, or emphysema cough accompanied by too much phlegm (mucus) Stop use and ask a doctor if cough lasts more than 7 days, comes back, or occurs with fever, rash, or persistent headache. These could be signs of a serious illness. If pregnant or breast-feeding, ask a health professional before use. Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away.
Drug Interactions
No interactions listed. Consult your pharmacist.
Contraindications
See prescribing information.
Storage & Handling
Other information FOR YOUR PROTECTION: Do not use if blister is torn or broken. store between 20-25°C (68-77°F)