Guajacuran (Guaifenesin)

Guajacuran is indicated for the symptomatic relief of chest congestion caused by excess mucus in the respiratory tract. It is commonly used in the following situations:

• Acute bronchitis with productive cough
• Common cold with thick sputum
• Upper respiratory tract infections that cause chest congestion
• Seasonal allergies that increase mucus production
• Post‑viral cough where mucus clearance is needed

Side effects of Guajacuran are generally mild, but patients should be aware of both common and less frequent reactions.

Common

• Nausea or mild stomach upset
• Headache
• Dizziness
• Mild rash or itching
• Dry mouth

Serious

• Severe allergic reaction (anaphylaxis) with swelling, difficulty breathing
• Persistent vomiting
• Significant rash with blistering or peeling
• Chest tightness unrelated to underlying condition

Before using Guajacuran, consider the following precautions to ensure safe use:

• Verify that you are not allergic to guaifenesin or any inactive ingredients.
• Consult a healthcare professional if you are pregnant, planning to become pregnant, or breastfeeding.
• Use caution in patients with chronic respiratory diseases such as asthma or COPD.
• Do not exceed the recommended daily dose; overuse may increase the risk of side effects.
• Keep the product out of reach of children; accidental ingestion can cause adverse effects.
• Discontinue use and seek medical advice if symptoms persist beyond a few days.

Guajacuran may interact with other medications, requiring attention to avoid adverse effects.

Avoid

• Monoamine oxidase inhibitors (MAOIs) taken within 14 days of guaifenesin.
• Other expectorants or mucolytics that could cause excessive thinning of mucus.

Use with caution

• Antitussive agents (cough suppressants) that may counteract the expectorant effect.
• Sedatives or antihistamines that can increase drowsiness.
• Diuretics, as they may affect fluid balance and mucus consistency.
• Alcohol, which can enhance dizziness or gastrointestinal upset.