8.8 Expectorants

Guaifenesin (Mucinex) is an example of an expectorant.

Mechanism of Action

Expectorants such as guaifenesin, reduce the viscosity of tenacious secretions by irritating the gastric vagal receptors that stimulate respiratory tract fluid and also increase the hydration of respiratory secretions. This results in decreasing the viscosity of respiratory tract secretions and facilitating mucous clearance.

Indication for Use

Expectorants are used for a productive cough and for loosening mucus from the respiratory tract. It is used as an OTC medication to loosen secretions, and also as a prescription for chronic bronchitis.

Nursing Considerations

Administration: oral dosing, elixir or tablet.  Do not eat or drink 30 minutes after elixir.  Immediate and extended release formulations.

The medication is well tolerated. For children, follow age-specific guidelines. Guaifenesin is only recommended for use during pregnancy and breastfeeding when the benefit outweighs the risk.

Adverse/Side Effects

Guaifenesin may cause a skin rash, headache, nausea, and vomiting (Frandsen & Pennington, 2018). These effects are generally mild and infrequent.

Client Teaching

  • Clients should attempt to avoid irritants that stimulate their cough.
  • Advise to increase fluid intake to enhance effectiveness.
  • Inform client that this medication can cause drowsiness.
  • Clients should avoid taking them with other CNS depressants or alcohol (Unbound Medicine, n.d.).

Guaifenesin Medication Card

Now let’s take a closer look at the medication card for guaifenesin (Daily Med, 2025; Velarde, 2020).

Downloadable file (.docx): Guaifenesin Medication Card

References

License

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Fundamentals of Nursing Pharmacology - 2nd Canadian Edition Copyright © 2026 by Andrea Sullivan Degenhardt is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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