Dextromethorphan Dose Table  
Dextromethorphan Dose Table
Child's weight (pounds)16-3132-4748-6364-7980-9596-129130+lbs
Liquid 5 mg/ 1 teaspoon (tsp)½123--tsp
Liquid 5 mg/ 5 milliliters (ml)2.557.51012.515--ml
Liquid 7.5 mg/1 teaspoon (tsp)----1123tsp
Liquid 7.5 mg/ 5 milliliters (ml)----557.51015ml
Liquid 10 mg/1 teaspoon (tsp)------112tsp
Liquid 10 mg/ 5 milliliters (ml)------557.510ml

When to Use.
Cough suppressant. Dextromethorphan (DM) is present in most cough syrups.

Table Notes:

  • AGE LIMIT. Don’t use under 4 years of age. (FDA)
  • Over 4 years of age. NOT advised as first treatment of cough. Use HONEY instead.
  • If under 6 years, don't give products with more than one ingredient in them. (Reason: FDA recommendations 10/2008).
  • DOSE. Find the child's weight in the top row of the dose table. Look below the correct weight for the dose based on the product you have.
  • MEASURE the DOSE. Syringes and droppers are better to use than teaspoons. If possible, use the syringe or dropper that comes with the medicine. If not, you can get a med syringe at a drug store. If you use a teaspoon, it should be a measuring spoon. (Reason: regular spoons are not reliable). Keep in mind 1 level teaspoon equals 5 ml and that ½ teaspoon equals 2.5 ml.
  • HOW OFTEN. Repeat every 6-8 hours as needed.
  • ADULT DOSE: 20 mg.

Author and Senior Reviewer: Barton D. Schmitt, M.D.

Content Set: Child Symptom Checker

Child Symptom Checker


This free app has a symptom checker,
dosage tables for common medications,
home health advice and more.

Apple version of the MD 4KIDS app
Android version of the MD 4KIDS app