Dextromethorphan Dosage Table  
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Dextromethorphan Dosage 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

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 not, medicine syringes are available at pharmacies. 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

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

Content Set: Pediatric HouseCalls Symptom Checker

Pediatric HouseCalls Symptom Checker