What is the recommended dose of Diphenhydramine (Benadryl) for a child weighing 23.678 kilograms?

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Last updated: April 6, 2025 • View editorial policy

From the Guidelines

For a child weighing 23.678 kg, the recommended Benadryl (diphenhydramine) dose is approximately 23.678 kg * 1-2 mg/kg = 23.678-47.356 mg, which can be rounded to 24-48 mg per dose, with a maximum of 50 mg per dose, as stated in the study 1 and 2. The dose can be administered every 6 hours as needed, not exceeding 4 doses in 24 hours.

  • For liquid formulations, which typically come as 12.5 mg/5 mL, this would be about 9.6-19.2 mL per dose for the lower end of the range and 19.2 mL for the upper end, considering the maximum dose of 50 mg.
  • Always check the specific concentration on the product you have, as formulations vary.
  • Benadryl is an antihistamine that works by blocking histamine receptors, helping to relieve allergy symptoms like itching, sneezing, and runny nose.
  • Side effects may include drowsiness, dry mouth, and dizziness.
  • This medication should not be given to children under 2 years without medical supervision, and you should consult a healthcare provider before giving Benadryl if the child has any medical conditions or takes other medications.
  • It's essential to note that diphenhydramine is considered second-line therapy to epinephrine and should never be administered alone in the treatment of anaphylaxis, as mentioned in the study 1.

From the Research

Dosage Information for Benadryl in Children

  • The provided studies do not offer specific dosage information for Benadryl (diphenhydramine) in children based on their weight.
  • However, it is essential to note that the studies 3, 4 discuss the potential risks and side effects associated with diphenhydramine, especially in children and older adults, suggesting that its use should be approached with caution.

Considerations for Antihistamine Use in Children

  • Studies 5, 6 focus on the comparison between first-generation antihistamines like diphenhydramine and second-generation antihistamines, highlighting the latter's favorable side effect profile and similar efficacy.
  • The study 6 mentions that newer antihistamines are potentially safer, causing less sedation with similar efficacy, which could be an important consideration when deciding on antihistamine use in children.

Lack of Direct Evidence for Dosage Calculation

  • There are no research papers provided that directly assist in calculating the dosage of Benadryl for a child weighing 23.678 kg.
  • For accurate dosage information, it is recommended to consult a healthcare professional or refer to the most current and relevant medical guidelines.

Professional Medical Disclaimer

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.