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Robitussin is a well-known brand of over-the-counter medication that provides relief from various cough and cold symptoms.

Last Modified: 03 May 2024

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What is Robitussin? 

Robitussin is a well-known brand of over-the-counter medication that provides relief from various cough and cold symptoms. The active ingredients in Robitussin products vary depending on the specific formulation but may include guaifenesin, dextromethorphan, and pseudoephedrine, among others. 

Robitussin formulations are designed to address symptoms such as cough, congestion, and mucus buildup. They come in different forms, including syrups, capsules, and liquid-filled capsules. 

Global Name

Generic name: Guaifenesin and Dextromethorphan
Brand names: Robitussin DM, Robitussin CF, and Robitussin AC, among others. 


What is Robitussin used for? 

Robitussin is used to treat a variety of respiratory conditions, such as: 

  • Temporary relief of coughs due to minor throat and bronchial irritation 
  • Cough associated with the common cold 
  • Chest congestion 
  • Mucus buildup 

How do you use Robitussin? 


Robitussin is available in syrup, capsule, and liquid-filled capsule forms.

Dosage information: 

  • Adults and children 12 years and over: The typical dose is 2 teaspoons (10 mL) every 4 to 6 hours. 
  • Children 6 to under 12 years: The dose is usually 1 teaspoon (5 mL) every 4 to 6 hours. 
  • Children under 6 years: Consult a doctor for the appropriate dosage. 


  • Children: Suitable for children over a certain age, depending on the product. 
  • Adults: Suitable for adults. 
  • Elderlies: Suitable, but may require dosage adjustment based on health status. 
  • Pregnancy: Consult with a healthcare provider before use. 
  • Lactation: Consult with a healthcare provider before use. 


Those allergic to any ingredients in Robitussin should avoid it. 

Any warnings and precautions : 

Do not use with other cough suppressants or expectorants unless directed by a healthcare provider. 

Interactions and contraindications: 

Avoid using with MAO inhibitors or other medications without consulting a healthcare provider. 

Side Effects

Side effects may include dizziness, drowsiness, nausea, and vomiting. 

Pharmacist Tips

Storage Information: 

  • Store at room temperature, away from direct light and moisture. 

Handling Instructions: 

  • Measure liquid forms of Robitussin with a special dose-measuring spoon or cup, not a regular table spoon.


Where is Robitussin available in Hong Kong?

Robitussin is an over-the-counter (OTC) medication that can be sold without a prescription. It is found in all chain drug stores, including Mannings and Watsons. 


Can Robitussin be used for a dry cough?

Yes, formulations like Robitussin DM are designed to relieve dry cough.

Can I take Robitussin if I have high blood pressure?

Some Robitussin products contain pseudoephedrine, which can raise blood pressure. Choose a product free of this ingredient and consult your healthcare provider.

How long can I take Robitussin for a persistent cough?

If symptoms persist for more than 7 days, worsen, or are accompanied by fever, consult a healthcare provider.

How to take Robitussin 600mg?

Robitussin 600mg typically refers to the guaifenesin content in an expectorant formulation. Follow the dosing instructions on the label or from your healthcare provider. It's usually taken every 4 to 6 hours with a full glass of water.

How long does Robitussin last?

The effects of Robitussin can last between 4 to 6 hours, depending on the specific formulation. Always check the label for the exact duration and take as directed. 


This website provides content related to drug use and medicine for informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Do not use the information on this website to diagnose or treat a health problem or disease without consulting a qualified healthcare provider. The website's owners and contributors are not liable for any repercussions, adverse effects, or consequences resulting from the use of any medication or information provided herein.

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