Dextromethorphan Dosage

Because there are numerous products that contain dextromethorphan, your dosage will depend on your age and the specific product you are using. Regardless of the product used, adults should not take more than 120 mg of dextromethorphan in a day. Also, this medication should not be used in children younger than four years old without their healthcare provider's approval.

An Introduction to Your Dosage of Dextromethorphan

The dose of dextromethorphan your healthcare provider recommends will depend on your age and the particular dextromethorphan product you are taking.
 
As is always the case, do not adjust your dosage unless your healthcare provider specifically tells you to do so.
 

Dextromethorphan Dosing Guidelines

The usual dose of dextromethorphan for treating a cough in adults and children 12 years old and older is as follows:
 
  • For dextromethorphan polistirex syrup (Delsym®) -- 60 mg every 12 hours
  • For other oral liquid or syrup -- 10 mg to 20 mg every 4 hours or 30 mg every 6 to 8 hours
  • For tablets and gelcaps -- 20 mg to 30 mg every 6 to 8 hours
  • For lozenges -- 5 mg to 15 mg every 1 to 4 hours
  • For strips -- 30 mg every 8 hours.
 
Adults should not use more than 120 mg of dextromethorphan in a day.
 
The usual dextromethorphan dose for treating a cough in children 6 to 12 years old is as follows:
 
  • For dextromethorphan polistirex syrup (Delsym) -- 30 mg every 12 hours
  • For other oral liquid or syrup -- 10 mg every 4 hours or 15 mg every 6 to 8 hours
  • For strips -- 10 mg every 4 hours or 15 mg every 6 to 8 hours.
 
Children 6 to 12 years old should not use more than 60 mg of dextromethorphan in a day.
 
The usual dextromethorphan dose for treating a cough in children 4 to 6 years old is as follows:
 
  • For dextromethorphan polistirex syrup (Delsym) -- 15 mg every 12 hours
  • For other oral liquid or syrup -- 5 mg every 4 hours or 7.5 mg every 6 to 8 hours
  • For strips -- 5 mg every 4 hours or 7.5 mg every 6 to 8 hours.
 
Children 4 to 6 years old should not use more than 30 mg of dextromethorphan in one day.
 
Dextromethorphan should not be used in children younger than four years old unless directed by a healthcare provider.
 
5 Tips to Keep a Cold at Bay

Dextromethorphan Medication Information

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