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Dextromethorphan Dosage Table

Child's Weight (pounds)  16-31 32-47 48-63 64-79 80-95 96-129 130+ lbs
Liquid 5mg/ 1 teaspoon (tsp) ½ 1 2 3 -- tsp
Liquid 5 mg/5 milliliters (ml) 2.5 5 7.5 10 12.5 15 -- ml
Liquid 7.5 mg/1 teaspoon (tsp) -- -- 1 1 2 3 tsp
Liquid 7.5 mg/ 5 milliliters (ml) -- -- 5 5 7.5 10 15 ml
Liquid 10 mg/1 teaspoon (tsp) -- -- -- 1 1 2 tsp
Liquid 10 mg/ 5 milliliters (ml) -- -- -- 5 5 7.5 10 ml

Indication: Cough suppressant. Dextromethorphan (DM) is present in most cough syrups.

Table Notes:

  • AGE LIMIT: Don’t use under 4 years of age.
  • Over 4 years of age: NOT recommended as primary treatment of cough. Use HONEY instead.
  • Avoid multi-ingredient products in children under 6 years of age. (Reason: FDA recommendations 10/2008).
  • DOSAGE: Determine by finding child's weight in the top row of the dosage table.
  • MEASURING the DOSAGE: Syringes and droppers are more accurate than teaspoons. If possible, use the syringe or dropper that comes with the medication. If you use a teaspoon, it should be a measuring spoon. Regular spoons are not reliable. Also, remember that 1 level teaspoon equals 5 ml and that ½ teaspoon equals 2.5 ml.
  • FREQUENCY: Repeat every 6-8 hours as needed
  • ADULT DOSE: 20 mg

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Disclaimer: This information is not intended to be a substitute for professional medical advice. It is provided for educational purposes only. You assume full responsibility for how you choose to use this information. For more information, click here.

Copyright: Copyright 1994-2012 Barton D. Schmitt, M.D.
Author and Senior Reviewer: Barton D. Schmitt, M.D.
Last Revised: 8/16/2011
Content Set: Pediatric HouseCalls Symptom Checker
Version Year: 2012

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