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Benadryl Dosage

Young child with seasonal allergies needing weight-based dosing with liquid formulation

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Evidence-based calculations Used in clinical settings worldwide Regular monitoring recommended

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Why: This calculation helps assess important health parameters for clinical and personal wellness tracking.

How: Enter your values above and the calculator will apply validated formulas to compute your results.

Evidence-based calculationsUsed in clinical settings worldwide
Sources:Medical LiteratureWHO Guidelines

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Understanding Benadryl DosageUse the calculator below to check your health metrics

👶 Toddler (22 lbs) - Allergic Reaction

Young child with seasonal allergies needing weight-based dosing with liquid formulation

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👧 Child (45 lbs) - Seasonal Allergies

School-age child with hay fever needing daytime allergy relief

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🐝 Teen (110 lbs) - Bee Sting Reaction

Teenager with acute allergic reaction from insect sting requiring antihistamine

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😴 Adult - Sleep Aid

Adult using diphenhydramine as an occasional sleep aid

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👴 Elderly (75 years) - Allergies with Fall Risk

Older adult with allergies requiring careful dosing due to sedation and fall risk

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Patient Information

Demographics

Age 2+ years (consult doctor if under 2)
Used for weight-based dosing in children

Indication

Formulation

Choose appropriate formulation for age/preference

Medical History

Current Medications

Special Populations

For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.

🏥 Health Facts

— WHO

— CDC

What is Benadryl (Diphenhydramine)?

Benadryl is the brand name for diphenhydramine, a first-generation antihistamine used to treat allergies, cold symptoms, and as a sleep aid. For children, proper weight-based dosing is essential for safety and effectiveness.

Weight-Based Dosing

Children require weight-based dosing (1-1.25 mg/kg) for safe and effective treatment.

Multiple Formulations

Available in liquid, chewable, tablets, and capsules for different ages and preferences.

Sedation Warning

Causes drowsiness - use caution with driving and avoid in elderly when possible.

How to Dose Diphenhydramine Safely

Weight-Based Dosing Table

Weight (lbs)Liquid 12.5mg/5mLChewable 12.5mgTablet 25mg
20-24 lbs4 mL--
25-37 lbs5 mL1 tablet1/2 tablet
38-49 lbs7.5 mL1.5 tablets1/2 tablet
50-99 lbs10 mL2 tablets1 tablet
100+ lbs20 mL4 tablets2 tablets

When to Use Benadryl

Appropriate Uses

  • • Allergic reactions
  • • Hay fever symptoms
  • • Itching/hives
  • • Occasional insomnia (adults)
  • • Motion sickness

Use with Caution

  • • Elderly patients (prefer non-sedating)
  • • Prostate problems
  • • Open-angle glaucoma
  • • Asthma/COPD
  • • During the day (sedating)

Avoid/Do Not Use

  • • Under 2 years (unless directed)
  • • Narrow-angle glaucoma
  • • To sedate children
  • • With alcohol
  • • With other sedatives

Dosing Formulas

Weight-Based Pediatric Dose

Dose = Weight (kg) x 1-1.25 mg/kg
Maximum single dose: 25mg (under 12 years)
Frequency: Every 4-6 hours as needed

Liquid Volume Calculation

For 12.5mg/5mL liquid:
Volume (mL) = Dose (mg) ÷ 2.5
Example: 12.5mg ÷ 2.5 = 5 mL

Adult Dosing

Standard: 25-50mg every 4-6 hours
Sleep aid: 50mg at bedtime
Maximum: 300mg per 24 hours
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