If you’ve ever had a cough, chances are you’ve heard of Robitussin DM.
But what is the DM in Robitussin DM? The answer lies in its active ingredients.
Robitussin DM is a cough syrup that contains two active ingredients: dextromethorphan and guaifenesin.
Dextromethorphan is an antitussive drug that helps relieve constant coughing by suppressing the cough reflex in the brain.
Guaifenesin, on the other hand, is an expectorant that helps thin and loosen mucus in the airways, making it easier to cough up.
Together, these two ingredients work to provide relief from coughs and congestion.
While Robitussin DM is available over-the-counter, it’s important to follow the recommended dosage and speak with your doctor if you have any concerns or underlying medical conditions.
What Is The DM In Robitussin?
If you have ever used Robitussin cough syrup, you may have noticed that some of them have “DM” in their name.
But what does DM mean? Let’s take a closer look at DM in Robitussin and what it does.
DM
DM stands for dextromethorphan, which is a cough suppressant. It works by blocking the cough reflex in your brain, which helps to reduce coughing.
Dextromethorphan is used in many over-the-counter cough and cold medicines, including Robitussin DM.
It is important to note that dextromethorphan should not be used for a persistent cough caused by smoking, asthma, or emphysema, as it will not be effective in treating these types of coughs.
Robitussin
Robitussin is a brand of cough and cold medicine that contains various active ingredients depending on the specific product.

The original Robitussin formula contains only guaifenesin, which is an expectorant that helps to loosen mucus and make coughs more productive.
Robitussin DM, on the other hand, contains both dextromethorphan and guaifenesin.
This combination of ingredients helps to both suppress coughs and make them more productive, which can be helpful for people who have a cough with chest congestion.
It is important to always read the label and follow the recommended dosage instructions for any medication, including Robitussin DM.
If you have any questions or concerns about using Robitussin DM, talk to your healthcare provider.
How Does DM Work?
Robitussin DM is a combination medication that contains guaifenesin and dextromethorphan.
Dextromethorphan (DM) is a cough suppressant that works by affecting the signals in the brain that trigger cough reflex.
Guaifenesin, on the other hand, is an expectorant that works by loosening and thinning mucus in the airways, making it easier to cough up and expel from the body.
Suppressing Coughs
The dextromethorphan in Robitussin DM works by blocking the cough reflex in the brain.
This means that even if you have a cough, you won’t feel the urge to cough as often or as strongly.
By suppressing coughs, DM can help provide relief from persistent, irritating coughs that are caused by minor throat irritation or a cold.
Effects On The Body
When you take Robitussin DM, the active ingredients are absorbed into your bloodstream and distributed throughout your body.
The dextromethorphan in the medication can cause drowsiness, dizziness, and other side effects, which is why it’s important to avoid driving or operating heavy machinery until you know how the medication affects you.
The guaifenesin in Robitussin DM can also cause side effects, such as nausea, vomiting, and stomach upset.
It’s important to follow the recommended dosage instructions when taking Robitussin DM.
Taking too much of the medication can increase the risk of side effects and may even be harmful to your health.
If you have any concerns about taking Robitussin DM, talk to your doctor or pharmacist.
Is DM Safe?
If you are considering using Robitussin DM, you may be wondering if it is safe.
While this medication is generally considered safe when used as directed, there are some important things to keep in mind.

Possible Side Effects
Like any medication, Robitussin DM can cause side effects. Some of the possible side effects include:
- Drowsiness
- Dizziness
- Nausea
- Vomiting
- Constipation
- Stomach upset
If you experience any of these side effects, stop taking Robitussin DM and talk to your doctor.
Interactions With Other Drugs
Robitussin DM can interact with other drugs, including prescription medications, over-the-counter medications, and herbal supplements.
Before taking this medication, be sure to tell your doctor about all the medications and supplements you are taking.
Some medications that can interact with Robitussin DM include:
Medication | Possible Interaction |
---|---|
MAO inhibitors (e.g. phenelzine, tranylcypromine) | Can cause a dangerous increase in blood pressure |
Antidepressants | Can increase the risk of serotonin syndrome |
Other cough and cold medications | Can increase the risk of side effects |
Again, it is important to talk to your doctor about any medications or supplements you are taking before taking Robitussin DM.
Key Takeaways
Robitussin DM is a cough medicine that contains two active ingredients: guaifenesin and dextromethorphan.
Guaifenesin is an expectorant that helps loosen mucus in the chest and throat, making it easier to cough up.
Dextromethorphan is a cough suppressant that works by blocking the cough reflex in the brain.
When taking Robitussin DM, it’s important to follow the instructions closely and use the measuring device that comes with the medicine to ensure you take the correct dose.
You can take Robitussin DM with or without food, but if it upsets your stomach, it may be helpful to take it with food.
It’s also important to drink plenty of non-caffeinated liquids while taking Robitussin DM to help thin out mucus and keep you hydrated.
Some common side effects of Robitussin DM include dizziness, drowsiness, nausea, and vomiting.
If you experience any severe side effects or have an allergic reaction, seek medical attention immediately.
Overall, Robitussin DM can be an effective treatment for cough and chest congestion due to colds or the flu.
However, it’s important to use it as directed and talk to your doctor if you have any concerns or questions about using this medication.