Guaifenesin

What is Guaifenesin for?

This medication is also known as guaiphenesin. It is an expectorant that works by thinning and loosening mucus in the airways, helping to clear chest congestion thus making breathing easier. It may come in the form of a syrup or tablet. It may also be found in combination with other ingredients for the relief of cough, blocked nose, pain or fever. 

How should I take or use Guaifenesin?

• Take this medication as recommended by your healthcare professional. Consult your healthcare professional if you are not sure how to take this medication correctly.
• This medication may be taken with or without food.
• For syrups, shake the bottle well before use.
• If your symptoms persist or worsen after one week of taking this medication, please talk to your healthcare professional. 

What should I do if I forget to take or use Guaifenesin?

Guaifenesin may be taken when required for a short period of time. This means that you do not have to take the medication if you do not have any symptoms. If you miss a dose, take it as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and continue normally. Do not take two doses or extra medication to make up for the missed dose. 

What precautions should I take when taking or using Guaifenesin?

Inform your healthcare professional if:

• You are allergic to guaifenesin, or any other ingredients used in this medication.
• You are pregnant, planning to become pregnant or breastfeeding.
• You are taking any other medications, including supplements, traditional medications and herbal remedies.
• You have existing conditions such as stomach ulcers, liver or kidney problems and lung conditions e.g. Chronic Obstructive Lung Disease (COPD) or severe uncontrolled asthma.
• You have a cough with thick yellow or green phlegm or mucus, or blood.
• You have a fever of more than 38.6^oC.
• You lose weight even though you are not trying to do so.
• You have night sweats.
• Your cough lasts for more than 3-4 weeks.
• You start having new symptoms during self-treatment. 

What food or medication should I avoid when I take or use Guaifenesin?

Let your healthcare professional know if you are taking, or planning to take any other herbal products, supplements or medications.  

What are some common side effects of Guaifenesin?

• Drowsiness
  • If affected, avoid driving, operating machinery, or other activities which require concentration.
• Nausea
• Vomiting  
• Stomach pain
• Diarrhoea

These side effects are usually mild and will pass quickly. If the side effects are bothersome, do not go away or get worse, speak to your healthcare professional. 

What are some rare but serious side effects that I need to seek medical advice immediately?

The symptoms of a drug allergy include one or more of the following:

• Swollen face/eyes/lips/tongue
• Difficulty in breathing
• Itchy skin rashes over your whole body

If you experience any of these symptoms, you should stop this medication and see your doctor immediately. 

You can also find out about drug allergies by watching these videos:
They are available in English, 中文, Melayu and தமிழ்: Drug Allergies

How should I store Guaifenesin?

Store in a cool and dry place away from direct sunlight. Keep this medication away from children.   

How do I throw away Guaifenesin safely?

Pack this medication into a black trash bag and seal it tightly before throwing it into the rubbish chute or bin.