Precautions and Warnings With Dextromethorphan

When taking dextromethorphan, it is important to know that this medication can make certain conditions worse, including asthma, emphysema, and chronic bronchitis. Other safety precautions with dextromethorphan involve warnings about taking this drug while pregnant or breastfeeding. It should also be noted that this drug may negatively react with certain medications and should not be used in children younger than four years old.

What Should I Tell My Healthcare Provider Before Taking Dextromethorphan?

You should talk with your healthcare provider prior to taking dextromethorphan if you have:
 
  • Lung problems, such as asthma, emphysema, or chronic bronchitis
  • A cough that has lasted more than seven days
  • A cough that is accompanied by excessive phlegm or mucus
  • A cough that went away and came back
  • A fever, rash, or persistent headache
  • A tartrazine (FD&C Yellow No. 5) sensitivity
  • A history of an allergic reaction to aspirin
  • Diabetes
  • A history of abusing drugs or alcohol
  • Any allergies, including to medications, foods, dyes, or preservatives.
 
Also, let your healthcare provider know if you are:
 
  • Pregnant or thinking of becoming pregnant
  • Breastfeeding.
 
You should also tell your healthcare provider about all other medications you are taking, including prescription and nonprescription medicines, vitamins, and herbal supplements.
 
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Written by/reviewed by: Susan Lakey, PharmD, MPH
Last reviewed by: Kristi Monson, PharmD
 
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