What is guaifenesin used for? 

Guaifenesin is a medication which is called a “cough expectorant”. This means that medication will thin the mucus so that it can be coughed out of the body. 

What are the most common side effects seen with guaifenesin? 

• Dizziness 

• Drowsiness 

• Headache

• Skin rash

• Nausea and vomiting

Contraindications & Warnings

Guaifenesin should not be taken by any child less than 2 years of age and should be used with caution in children greater than 2 years of age. Guaifenesin has not been well studied in this younger age which is why it is not recommended. In addition, there have been serious adverse reactions such as death that have been reported with its use in children less than 2 years of age. 

Always consult with your child’s doctor about taking guaifenesin to see if it is an appropriate option. 

Tips & Tricks to administer guaifenesin

Always administer guaifenesin with an accurate measuring device. Do not use a household spoon as this may cause an unintentional overdose. 

Guaifenesin can and should be administered with a large quantity of fluid to ensure that it works appropriately. This can either be water or the child’s favorite drink. 

Breast feeding considerations 

• Guaifenesin can be present in breast milk if being taken by the mother. 

• There are little to no reports of mothers taking guaifenesin while breastfeeding, and therefore the effect on the infant is unknown. If the mother is taking guaifenesin while breastfeeding, the infant should be monitored closely for signs of adverse effects such as nausea, vomiting, diarrhea and constipation. 

The information in this database regarding prescription drugs is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interaction or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate, or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment. See disclaimer.