Quick Answer
The main difference between Robitussin and Robitussin DM is that Robitussin DM contains the cough suppressant dextromethorphan while regular Robitussin does not. Robitussin is a brand name for over-the-counter cough and cold medicines produced by Pfizer. Robitussin DM contains the active ingredients dextromethorphan hydrobromide, guaifenesin, and phenylephrine hydrochloride. Regular Robitussin contains guaifenesin as the main active ingredient and may also contain phenylephrine or pseudoephedrine as decongestants.
What is Robitussin?
Robitussin is a widely used over-the-counter cough and cold medicine brand made by Pfizer. It comes in many varieties and formulations targeted towards different cold and flu symptoms. The active ingredients in Robitussin products include:
– Guaifenesin – an expectorant that helps thin mucus secretions and make coughs more productive.
– Dextromethorphan (in Robitussin DM) – a cough suppressant that reduces the urge to cough.
– Phenylephrine – a nasal decongestant.
– Pseudoephedrine – also used as a decongestant.
– Acetaminophen – for pain and fever reduction.
– Antihistamines like chlorpheniramine – for reducing runny noses and sneezing.
Some popular Robitussin products include:
– Robitussin Cough + Chest Congestion DM – contains guaifenesin, dextromethorphan HBr, and phenylephrine.
– Robitussin Nighttime Cough DM – includes dextromethorphan HBr and doxylamine succinate (an antihistamine).
– Robitussin Cold & Flu Nighttime – contains dextromethorphan HBr, guaifenesin, and the antihistamine doxylamine succinate.
– Robitussin Peak Cold Cough + Congestion DM – includes dextromethorphan HBr, guaifenesin, and phenylephrine.
So in summary, products with “DM” in the name contain the cough suppressant dextromethorphan while other Robitussin formulations do not.
What is Robitussin DM?
Robitussin DM is a line of Robitussin products designed specifically for dry, hacking coughs. The DM stands for “dextromethorphan”, which is the primary active ingredient in Robitussin DM.
Dextromethorphan is an over-the-counter cough suppressant that belongs to the class of drugs called antitussives. Antitussives work by suppressing the cough reflex in the brain, reducing the urge to cough.
In addition to dextromethorphan, Robitussin DM products typically contain other ingredients such as:
– Guaifenesin – an expectorant that loosens mucus.
– Phenylephrine or pseudoephedrine – nasal decongestants.
– Acetaminophen – for pain relief.
– Antihistamines like doxylamine – to help dry up runny noses.
The dextromethorphan in Robitussin DM is what sets it apart from regular Robitussin. The dextromethorphan provides targeted relief for dry, unproductive coughs by reducing the frequency and intensity of cough spasms.
Some popular Robitussin DM products include:
– Robitussin Cough + Chest Congestion DM
– Robitussin Nighttime Cough DM
– Robitussin Maximum Strength Cough + Congestion DM
So in summary, Robitussin DM contains the cough suppressing ingredient dextromethorphan while regular Robitussin does not. This makes Robitussin DM better suited for dry, hacking coughs where suppressing the cough reflex is the priority.
Active Ingredients in Robitussin vs Robitussin DM
Here is a comparison of the active ingredients in regular Robitussin versus Robitussin DM formulations:
| Robitussin | Main Active Ingredients |
| Regular Robitussin |
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| Robitussin DM |
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As you can see, the key difference is that Robitussin DM contains dextromethorphan as a cough suppressant while regular Robitussin does not.
Regular Robitussin relies on the expectorant guaifenesin as the main active ingredient to help thin mucus and loosen phlegm. It may additionally contain phenylephrine or pseudoephedrine to relieve nasal congestion.
Robitussin DM also contains guaifenesin for mucus thinning but adds dextromethorphan to suppress the cough reflex directly. It provides targeted relief for dry, unproductive coughs.
Uses of Robitussin vs Robitussin DM
Here is an overview of when you should use regular Robitussin versus Robitussin DM:
Regular Robitussin Uses
Regular Robitussin is best for:
– Chest congestion and mucus-producing coughs
– Loosening and thinning excess phlegm and mucus
– Wet, productive coughs
The guaifenesin expectorant in regular Robitussin helps thin the mucus secretions and relaxes the airway muscles to promote productive coughing. This helps clear phlegm and mucus more effectively.
Regular Robitussin may provide relief for chest congestion, bronchitis, sinus drainage, and wet coughs. It can make coughs more productive.
Robitussin DM Uses
Robitussin DM is ideal for:
– Dry, hacking coughs
– Coughs with little or no phlegm or mucus
– Tickling coughs that are repetitive and irritating
– Nighttime coughs that disrupt sleep
The dextromethorphan in Robitussin DM suppresses the urge to cough. This provides relief for dry, unproductive coughs by reducing coughing fits.
Robitussin DM can provide relief for coughs due to colds, flu, allergies, inhaled irritants, and viral infections like COVID-19. It helps control coughing at night to promote rest.
Side Effects of Robitussin and Robitussin DM
Both regular Robitussin and Robitussin DM are generally safe when used as directed. However, they can cause some side effects including:
Common side effects
– Drowsiness or dizziness
– Nausea, stomach discomfort
– Dry mouth
– Headaches
Robitussin DM side effects
– Dizziness
– Confusion
– Rapid heartbeat
– Nausea and vomiting
Dextromethorphan in high doses can sometimes cause euphoria, hallucinations, and dissociative effects. Misuse can lead to dependence and addiction.
Children may be more susceptible to side effects from dextromethorphan. Caregivers should follow dosing instructions carefully.
Robitussin side effects
– Rash or hives
– Difficulty breathing
– Swelling of the throat, lips, tongue
Some people may experience allergic reactions to ingredients in regular Robitussin like pseudoephedrine. Seek medical help if you experience severe side effects.
Dosage and Administration
It’s important to follow the dosage instructions on the Robitussin product you are using. Here are some general dosage guidelines:
Robitussin DM dosage
Adults and children 12+: 10-20mg dextromethorphan every 4 hours. Do not exceed 120mg within 24 hours.
Children 6-11: 5-10mg dextromethorphan every 4 hours. Do not exceed 60mg per day.
Children under 6: Do not administer Robitussin DM without first consulting a doctor.
Measure liquid doses carefully using the included dosing cup. Tablets should be taken with a full glass of water.
Regular Robitussin dosage
Adults and children 12+: 10-20ml every 4-6 hours. Do not exceed 120ml per day.
Children 6-11: 5-10ml every 4-6 hours. Do not exceed 60ml per day.
Children under 6: Consult a doctor for appropriate dosing.
Carefully measure out the proper dose using an accurate milliliter measuring device. Do not give more than the recommended amount.
Warnings
– Do not take Robitussin DM if you are taking a prescription monoamine oxidase inhibitor (MAOI) or within 2 weeks of stopping MAOI treatment.
– Do not use Robitussin DM if you have a chronic cough such as occurs with smoking, asthma, chronic bronchitis, or emphysema.
– Stop use of Robitussin DM and contact your doctor if your cough persists or worsens, if you develop a fever, rash, persistent headache, or if symptoms last more than 7 days.
– Do not take more than the recommended dosage of Robitussin products.
– Keep both regular Robitussin and Robitussin DM out of reach of children to prevent accidental overdose.
– Dextromethorphan in high doses can be habit forming and lead to psychological dependence. Use Robitussin DM only as directed.
– If you have difficulty swallowing the tablets, you can dissolve them in a small amount of water before drinking.
Conclusion
Robitussin and Robitussin DM share many similarities but have one major difference: Robitussin DM contains the cough suppressant dextromethorphan while regular Robitussin does not.
This makes Robitussin DM preferable for dry, hacking coughs where suppressing the cough reflex is desired. Regular Robitussin is better suited for chest congestion and productive coughs where loosening phlegm and mucus is the goal.
When used correctly, both Robitussin formulations can provide relief for cough and cold symptoms. Be sure to follow dosing directions carefully, especially when giving to children. Talk to your doctor if your symptoms persist or worsen. With proper use, Robitussin can safely and effectively help suppress coughs and loosen mucus.
