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Chlorpheniramine (Antihistamine) Dosage Table

 Child's Weight (pounds)



44-54   55-65  66-76 77-87  88+  lbs
 Liquid 2 mg/5 milliliters (mL) 2.5​ 4 5 5 7.5 7.5 10 mL
 Tablets 4 mg



½ ½ ½ 1 1 tablets

Indications: For allergic reactions, nasal allergies, hives and itching.

Table Notes:

  • AGE LIMIT: For allergies, don't use under 1 year of age (Reason: it's a sedative). For colds, not recommended at any age (Reason: no proven benefits) and should be avoided if under 4 years old. 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.
  • ADULT DOSAGE: 4 mg. Repeat every 6-8 hours as needed
  • 6-12 years LONG-ACTING (L.A.) DOSAGE: 8 mg long-acting (LA) tablet every 12 hours as needed
  • 12 years and older LONG-ACTING (L.A.) DOSAGE: 12 mg long-acting (LA) tablet every 12 hours as needed
  • Brompheniramine dosage is the same as chlorpheniramine dosage

Last Updated
Adapted from My Child Is Sick! Expert Advice for Managing Common Illnesses and Injuries (Copyright © 2011 Barton D. Schmitt, MD, FAAP)
The information contained on this Web site should not be used as a substitute for the medical care and advice of your pediatrician. There may be variations in treatment that your pediatrician may recommend based on individual facts and circumstances.
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