What dose of Ed‑A‑Hist DM (chlorpheniramine 4 mg, dextromethorphan 15 mg, phenylephrine 10 mg per 5 mL) should be given to a child weighing 16.33 kg?

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Ed-A-Hist DM Dosing for 16.33 kg Child

This child should receive 5 mL of Ed-A-Hist DM every 4-6 hours, not to exceed 4 doses in 24 hours.

Dosing Rationale

At 16.33 kg, this child falls into the 6 to under 12 years age group for standard pediatric dosing of combination cough/cold products. The formulation contains chlorpheniramine 4 mg, dextromethorphan 15 mg, and phenylephrine 10 mg per 5 mL.

Component-Specific Considerations:

Chlorpheniramine (4 mg per 5 mL):

  • Standard pediatric dosing for children 6-12 years is 2 mg every 4-6 hours 1
  • At 16.33 kg, the 5 mL dose delivers 4 mg, which equals approximately 0.24 mg/kg
  • This falls within the therapeutic range of 0.35 mg/kg/dose used in pharmacokinetic studies 2
  • Therapeutic serum concentrations (2.3-12.1 ng/mL) are achieved with weight-appropriate dosing 3

Dextromethorphan (15 mg per 5 mL):

  • Children 6-11 years receive 15 mg doses 4
  • At 16.33 kg, this equals approximately 0.92 mg/kg
  • Research suggests optimal antitussive effect occurs at 0.5 mg/kg, with doses up to 0.94 mg/kg studied 5
  • This dose is within the established safe and effective range

Phenylephrine (10 mg per 5 mL):

  • Standard pediatric oral dosing for decongestant effect
  • The combination formulation provides age-appropriate dosing 6

Dosing Schedule

  • Dose: 5 mL every 4-6 hours
  • Maximum daily dose: 20 mL (4 doses) in 24 hours
  • Administer with or without food
  • Use calibrated measuring device, not household spoons

Important Safety Considerations

Weight-Based Dosing Caveat: While this child weighs 16.33 kg (typically corresponding to ages 4-5 years by weight alone), age-based dosing takes precedence for over-the-counter combination products 4, 1. If this child is actually under 6 years of age, reduce the dose to 2.5 mL every 4-6 hours (maximum 10 mL/24 hours).

Sedation Risk: Chlorpheniramine causes sedation, particularly in younger children (ages 2-5) 2. Monitor for drowsiness, especially during initial doses. The sedating effect is dose-dependent and more pronounced than with non-sedating antihistamines.

Contraindications:

  • Do not use in children under 4 years of age 4
  • Avoid in children taking MAO inhibitors
  • Use caution with other CNS depressants

Duration of Therapy:

  • Limit use to 7 days maximum for cough/cold symptoms
  • If symptoms persist beyond 7 days or worsen, re-evaluate for alternative diagnosis

References

3
Research

Pharmacokinetics and efficacy of chlorpheniramine in children.

The Journal of allergy and clinical immunology, 1982

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.