Can You Take Robitussin DM With Sudafed?
In our latest question and answer, the pharmacist discusses whether or not Robitussin DM can safely be taken with Sudafed.
Can I take Robitussin DM and Sudafed 12-hr at the same time?
Sep 01, 2022- Robitussin DM and Sudafed can be safely taken together with no interaction between them.
- Taking both medications together is often recommended if you have nasal congestion, sinus pressure, cough, or chest congestion.
- Sudafed may cause insomnia in some people, so it's best to take it earlier in the day rather than before bed.
Answer
Sudafed (pseudoephedrine) and Robitussin DM (guaifenesin; dextromethorphan) can safely be taken together. There is no interaction between the medications. In fact, the use of both together is often recommended if you have the following symptoms:
- Nasal congestion
- Sinus pressure
- Cough
- Chest Congestion
Below, I discuss Sudafed and Robitussin DM in more detail.
Sudafed
Sudafed (pseudoephedrine) is a commonly used nasal decongestant that works by producing vasoconstriction in the nasal passages, which shrinks swollen nasal membranes and relieves nasal congestion. Sudafed also acts to increase nasal airflow and drainage of sinus secretions.
Sudafed is typically well tolerated, but one of the most common adverse reactions to it is insomnia. Sudafed can have a slight stimulating effect in some, making it difficult to fall asleep easily. In fact, insomnia has a reported incidence rate of between 4% to 10% based on data obtained from studies. Therefore, it is important to take Sudafed earlier in the day to prevent insomnia.
Robitussin DM
Robitussin DM is a combination cough/cold medication and contains the following ingredients:
- Guaifenesin
- Dextromethorphan
Guaifenesin is classified as an expectorant and helps to thin mucus and reduce mucus viscosity. Dextromethorphan is a cough suppressant and helps to reduce the frequency and severity of cough.
Taking Sudafed With Robitussin DM
As mentioned above, Sudafed and Robitussin DM can safely be taken together. There is no interaction between the two medications.
Final Words
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References & sources
Glossary — Terms in This Answer
- Pseudoephedrine
- A chemical compound that narrows blood vessels to reduce nasal swelling and congestion.
- Guaifenesin
- A medication that thins mucus to make it easier to cough up and clear airways.
- Dextromethorphan
- A medication that suppresses cough by acting on the cough reflex center in the brain.
- Vasoconstriction
- The narrowing of blood vessels, which reduces swelling in nasal passages.
- Decongestant
- A medication that reduces nasal congestion by shrinking swollen nasal tissues.
- Expectorant
- A medication that helps clear mucus from the airways by making it thinner and easier to cough up.
- Mucus viscosity
- The thickness or stickiness of mucus in the respiratory system.
- Adverse reactions
- Unwanted or harmful side effects that occur when taking a medication.
Dr. Brian Staiger, PharmD
Doctor of Pharmacy, board certified clinical pharmacist (BCPS), American Herbalist Guild, Medication Therapy Management certified
Brian Staiger, PharmD, BCPS, is a licensed pharmacist with more than 13 years of experience across retail pharmacy, clinical pharmacy, medication safety, pharmacy program development, and healthcare administration. He is the founder of HelloPharmacist.com, where he helps patients...
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