DEXTROMETHORPHAN (DM) DOSAGE (COUGH SUPPRESSANT)
Child's weight more than (pounds) 16 32 48 64 80 96 130 lbs
Total amount (mg) 2.5 5 7.5 10 12.5 15 20 mg
Liquid 5 mg/5 ml (tsp) ½ 1 1½ 2 2½ 3 -- tsp
Liquid 7.5 mg/5 ml (tsp) -- -- 1 1 1½ 2 3 tsp
Liquid 10 mg/5 ml (tsp) -- -- -- 1 1 1½ 2 tsp

  • Dextromethorphan (DM) Dosage: determine by finding your child's weight in the top row of the dosage table. DM is present in most cough syrups.
  • Adult dose: 20 mg
  • Repeat every 6-8 hours as needed
  • Don't use under 1 year of age (Reason: cough is a protective reflex)

Disclaimer: This information is not intended 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.

Pediatric SelfCareNavigator. Copyright © 2000-2004 Barton Schmitt, M.D. FAAP

Reviewed 8/2004

Revised 7/2002

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