8.8 Expectorants V2
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, thus increasing the volume and decreasing the viscosity of respiratory tract secretions.
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 safe for all ages. 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).
Client Teaching
- Clients should attempt to avoid irritants that stimulate their cough.
- Inform client that this med 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
- Daily Med (2025). Guaifenesin. U.S. National Library of Medicine. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=6feaf29e-de06-4c94-912c-a76ea2cbd8c1
- Frandsen, G. & Pennington, S. (2018). Abrams’ clinical drug: Rationales for nursing practice (11th ed.). Wolters Kluwer. ↵
- Verlande, G. (2020). Pharmacology Notes: Nursing Implications for Clinical Practice. Licensed under CC BY-NC-SA 4.0.
