Skip to main content

We are aware of FDA’s proposed order to remove oral phenylephrine (PE) as a nasal decongestant from the OTC monograph. Note, FDA’s proposed order does not question the safety of oral PE, only efficacy. We have introduced several new formulations across our brand portfolios, to remove oral PE, to ensure product availability for consumers to treat their symptoms ahead of the 2024/2025 cold, cough, flu season and to provide new remedies and forms to ensure people have options.

What Does DM Mean in Cough Medicine?

When you’re looking for relief from cough and cold symptoms, the medicine aisle at your pharmacy can seem confusing because there are all kinds of formulations for nighttime relief, dry cough and chest congestion.

One of the most common things you might see on a label of cough medicine is “DM.” Explore what active ingredients comprise products like Robitussin DM and how it works to relieve your most irritating symptoms.

Woman looking at cough medicines

What Is DM in Cough Medicines?

DM stands for dextromethorphan, which is a common cough suppressant that belongs to a class of medications called antitussives.1 It works by calming your cough reflex and decreasing the amount of activity in the section of your brain that causes coughing.2,3

Dextromethorphan can be taken by adults and children over 6 years of age.1 Depending on individual medications, the amount of dextromethorphan can vary, but adults are generally recommended to take a 10-20mg dose by mouth every 4 hours, up to a maximum daily dose of 120 mg.1 Another option is to take a 30mg dose every 4 to 6 hours. Children with coughs between 6 to 11 years of age shouldn’t take more than 60mg of dextromethorphan a day. Be sure to deliver the proper dose to your children and have them take it either with food or on an empty stomach.1

Side Effects and Potential Interactions with Dextromethorphan

While it’s generally safe when taking the proper dose to treat a cough, dextromethorphan can interact with certain medications, including those treating depression and anxiety.2 Taking this medication can also come with minor side effects, including:3

  • dizziness
  • drowsiness
  • fatigue
  • nausea
  • vomiting
  • stomach pain

Many of these symptoms don’t require medical attention, but if these symptoms are severe or do not go away after a while, contact your doctor or medical professional.2,3 In addition, some allergic reactions that are more serious include skin rash, itching, hives or if you feel swelling on your lips, tongue or throat.2

Dextromethorphan can come in many forms, such as capsules, liquids and even chewable tablets such as Robitussin Soft Chews Nighttime DM and Robitussin Soft Chews Long-Acting Cough.3 These new medications can provide long-lasting relief from coughs in a convenient berry-tasting chewable.

If your cough is milder or combined with a sore throat, try Robitussin Elderberry Medi-Soothers. Providing up to 4 hours of cough relief, these liquid-filled lozenges contain effective cough suppressants and the taste of real elderberries.

Source Citations:

  1. Dextromethorphan. National Library f Medicine. https://www.ncbi.nlm.nih.gov/books/NBK538216/. Accessed 9/9/24.
  2. Dextromethorphan Solution. Cleveland Clinic. https://my.clevelandclinic.org/health/drugs/20631-dextromethorphan-solution/. Accessed 7/22/2024.
  3. Dextromethorphan. MedlinePlus. https://medlineplus.gov/druginfo/meds/a682492.html. Accessed 7/22/2024.
  • **True Source Honey is ethically and transparently sourced. Click here to learn more
  • ^Read more about our non-GMO standard. here
  • ⚬This product contains the active ingredients Dextromethorphan.
  • **This product contains the active ingredients Dextromethorphan and Guaifenesin.
  • *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
  • Use as Directed.