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Pediatric Dosing Principles
Children are NOT small adults — their bodies handle medications very differently.
Why Pediatric Dosing is Different
- Immature liver and kidneys — slower drug metabolism and excretion → drugs stay in the body longer → increased risk of toxicity
- Higher body water percentage — neonates are ~75% water (vs 60% in adults) → water-soluble drugs are diluted more, may need higher mg/kg doses
- Lower plasma protein levels — less protein binding → more free (active) drug in circulation → greater drug effect and toxicity risk
- Faster metabolic rate — children may metabolize some drugs faster, requiring more frequent dosing
- Body surface area (BSA) — proportionally larger in children → affects absorption of topical drugs
Golden Rules of Pediatric Pharmacology
- Always calculate doses based on weight (mg/kg) — never use adult doses
- Always verify the safe dose range before administering
- Double-check ALL calculations — small errors can be fatal in small patients
- Use oral syringes for liquid medications — never household spoons (inaccurate)
- Weigh in kilograms — NEVER estimate. Use a scale. All pediatric doses are calculated in kg.
The Margin of Error is Tiny
A dosing error that would be minor in an adult can be lethal in a child. A 10% calculation error on an adult dose of 500 mg = 50 mg difference (usually tolerable). A 10% error on a pediatric dose of 25 mg = 2.5 mg difference — which could be an overdose for a small infant. Always double-check.
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Weight-Based Dosing (mg/kg)
Every pediatric dose starts with the child's weight in kilograms.
1
Convert weight. Pounds to kilograms: divide by 2.2. Example: 44 lbs → 44 ÷ 2.2 = 20 kg
2
Calculate the dose. Dose = Weight (kg) × Ordered dose (mg/kg). Example: amoxicillin 25 mg/kg/day · 20 kg → 500 mg/day
3
Divide by frequency. Divided into 3 doses per day: 500 ÷ 3 = 166.7 mg per dose
4
Calculate volume. Suspension 250 mg/5 mL: (166.7 ÷ 250) × 5 = 3.3 mL per dose
Weight-Based Formula
Dose (mg) = Weight (kg) × mg/kg. Then: Volume (mL) = (Desired dose ÷ Have) × Vehicle. Example: Need 166.7 mg, have 250 mg/5 mL → (166.7 ÷ 250) × 5 = 3.3 mL. Always round to the nearest tenth for pediatric liquid doses.
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Safe Dose Range Calculations
Before giving ANY pediatric medication — verify the dose is within the safe range.
How to Calculate a Safe Dose Range
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Look up the drug's recommended dose range (mg/kg/day) in a drug reference
2
Multiply the child's weight (kg) by the minimum recommended dose → low end
3
Multiply the child's weight (kg) by the maximum recommended dose → high end
4
Compare the ordered dose to the range
Worked Example
Order: Amoxicillin 400 mg PO q8h for a child weighing 15 kg
Reference states: Amoxicillin safe dose is 25–45 mg/kg/day divided q8h
- Low end: 15 kg × 25 mg/kg = 375 mg/day ÷ 3 doses = 125 mg per dose
- High end: 15 kg × 45 mg/kg = 675 mg/day ÷ 3 doses = 225 mg per dose
- Safe range per dose: 125–225 mg
- Ordered dose: 400 mg → EXCEEDS the safe range → HOLD and notify the provider
If the Dose Exceeds the Maximum → HOLD
Do NOT administer a dose that exceeds the maximum safe dose range. Hold the medication, notify the provider, and document. Even if the provider insists → verify again and document your concern. Patient safety always comes first.
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Age-Appropriate Medication Administration
How you give the medication matters as much as what you give.
- Infants0–12 months
- Use oral syringe directed to the inner cheek (not back of throat — aspiration risk). Give in small amounts. Positioning: hold semi-upright. Never add medications to a full bottle of formula (if the infant doesn't finish, they don't get the full dose).
- Toddlers1–3 years
- Use oral syringe or medicine cup. Allow to sit up. Offer choices when possible ("Do you want grape or cherry flavor?"). Mix with small amount of food if permitted. Be prepared for refusal — never force, be patient and creative.
- Preschoolers3–5 years
- Simple, honest explanations. Offer choices and praise cooperation. Let them hold the medicine cup. Use positive language ("This will help your tummy feel better"). Avoid calling medication "candy."
- School-age6–12 years
- Explain why the medication is needed. May be able to swallow pills (practice with small candy first). Involve in their care — teach about their medications. Reward and praise cooperation.
- Adolescents13–18 years
- Provide privacy and autonomy. Explain the rationale. Address concerns about side effects honestly (especially appearance-related). Assess for medication compliance — teens may skip doses. Screen for substance use before prescribing.
Universal Rules for All Ages
- NEVER call medication "candy" — the child may find and take it on their own
- Use calibrated measuring devices (oral syringes, dosing cups) — NEVER household spoons
- Verify patient identity with 2 identifiers (name band + parent verification for non-verbal children)
- If a child vomits within 15–30 minutes of oral medication → notify provider (may need to redose)
- Liquid medications: shake well if suspension. Check expiration date.
- Ear drops: Pull pinna DOWN and BACK for children <3. Pull UP and BACK for children >3 and adults.
- Eye drops: Pull lower lid down to form a pocket. Drop medication into the conjunctival sac, not directly on the eye.
Exam Tip — Ear Drop Direction
Children <3 years: pull pinna DOWN and BACK. Children >3 and adults: pull pinna UP and BACK. This straightens the ear canal for proper medication delivery. This distinction is heavily tested.
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Pediatric Injection Sites
The site depends on the age and muscle development.
- Vastus lateralisPREFERRED <2 years
- Largest, most developed muscle in this age. Use 5/8–1 inch needle, 22–25 gauge. Max volume: 0.5 mL (infant), 1 mL (toddler).
- Ventroglutealchildren >2 years
- Preferred for older children and adolescents. No major nerves or vessels. 5/8–1 inch needle.
- Deltoidchildren ≥3 years · small volumes
- Used for vaccines (≤0.5–1 mL). Muscle must be adequately developed. 5/8–1 inch needle.
- DorsoglutealNOT recommended <3 years
- Risk of sciatic nerve injury. Muscle not well-developed until child has been walking. Avoid in young children.
Pediatric Injection Tips
- Use the smallest appropriate needle gauge and length
- Distraction techniques: bubbles, singing, having parent hold, vibrating cold device (Buzzy bee)
- EMLA cream applied 60 minutes before (numbs the site)
- Apply firm pressure after injection (reduces pain perception)
- For multiple injections: use different sites, give the most painful one last
- Never threaten a child with injections ("If you're bad, you'll get a shot")
- Praise after the procedure regardless of behavior
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Common Pediatric Medications
The drugs you'll see most often in pediatric nursing — with the key points for each.
- Acetaminophen (Tylenol)pain, fever
- Safe for all ages (including neonates). Dose: 10–15 mg/kg/dose q4–6h. Max 75 mg/kg/day. #1 cause of pediatric liver injury in overdose. Antidote: acetylcysteine. Available in infant drops (more concentrated) and children's liquid — do NOT confuse the two.
- Ibuprofen (Motrin/Advil)pain, fever, inflammation
- NOT for infants <6 months (renal immaturity). Dose: 5–10 mg/kg/dose q6–8h. Take with food. Anti-inflammatory effect (unlike Tylenol). GI irritation risk. Do NOT use in dehydrated children (renal risk).
- Amoxicillinotitis media, strep, UTI
- Most commonly prescribed pediatric antibiotic. Pink liquid. Refrigerate after reconstitution. Discard after 14 days. Check for penicillin allergy. May cause diarrhea and diaper rash.
- Albuterol (ProAir/Ventolin)asthma, bronchospasm
- Rescue inhaler/nebulizer. Side effects: tachycardia, tremors, hyperactivity. Use spacer with MDI for children. Rinse mouth after if using with inhaled corticosteroid. Given BEFORE steroid inhaler.
- Prednisolone/Prednisonecroup, asthma, allergy
- Short-course oral steroid. Tastes bitter — mix with juice or flavored syrup. May cause hyperactivity, increased appetite, mood changes. Monitor glucose. Taper if used >5 days.
- Diphenhydramine (Benadryl)allergic reactions, itching
- May cause paradoxical excitation in young children. Not recommended <2 years. Weight-based dosing. Can cause sedation — fall precautions.
- Ondansetron (Zofran)nausea/vomiting
- ODT (orally disintegrating tablet) available — dissolves on tongue. Used for gastroenteritis-related vomiting. Can cause constipation and QT prolongation.
- Epinephrine (EpiPen Jr)anaphylaxis
- EpiPen Jr (0.15 mg) for children 15–30 kg. Regular EpiPen (0.3 mg) for >30 kg. Inject into anterolateral thigh through clothing if needed. Teach families to carry 2 auto-injectors. Call 911 after use — effects are temporary.
- Methylphenidate (Ritalin/Concerta)ADHD
- Give in the AM (insomnia if given late). Side effects: decreased appetite (give after breakfast), weight loss, growth suppression — monitor height and weight on growth chart. Drug holidays may be used to allow catch-up growth.
- Digoxin (pediatric)heart failure, SVT in infants
- Hold if HR <90–110 in infants, <70 in children. Extremely narrow therapeutic index in peds. Doses are in MICROGRAMS (mcg), not mg — dosing errors can be fatal. Always double-check with another nurse.
Infant vs Children's Tylenol — DIFFERENT Concentrations
Infant concentrated drops and children's liquid Tylenol have DIFFERENT concentrations. Using the infant dropper with the children's concentration (or vice versa) can result in underdosing or overdosing. Always check the concentration on the label and use the measuring device that comes with that specific product.
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Aspirin & Reye Syndrome
One of the most tested pediatric pharmacology concepts on every nursing exam.
What is Reye Syndrome?
Reye syndrome is a rare but potentially fatal condition characterized by acute liver failure and encephalopathy (brain swelling). It is strongly associated with aspirin (salicylate) use in children with viral infections, especially influenza and varicella (chickenpox).
The Rule
- Do NOT give aspirin to children or adolescents under 19 years old with any viral illness
- Use acetaminophen or ibuprofen instead for fever and pain
- Exceptions: Kawasaki disease (aspirin is part of the treatment protocol under medical supervision) and certain rheumatic conditions
Signs of Reye Syndrome
- Persistent vomiting (early sign)
- Altered mental status — confusion, irritability, combativeness progressing to lethargy and coma
- Elevated liver enzymes (AST, ALT), elevated ammonia
- Hypoglycemia
- Can progress rapidly to seizures, increased ICP, and death
Parent Teaching
- Read ALL OTC medication labels — aspirin may be listed as "salicylate," "acetylsalicylic acid," or "ASA"
- Pepto-Bismol (bismuth subsalicylate) contains a salicylate — avoid in children
- If a child has chickenpox or flu-like symptoms → NEVER give aspirin-containing products
Exam Tip
If a question mentions a child with chickenpox or flu AND aspirin → the answer involves Reye syndrome. If it asks "which medication should the nurse question?" for a febrile child → aspirin is always the answer to question. This appears on virtually every nursing exit exam.
? A parent asks for aspirin to reduce fever in a 10-year-old with influenza. What is the nurse's response?
Do NOT give aspirin to children under 19 with a viral illness — it is associated with Reye syndrome (liver failure + encephalopathy). Recommend acetaminophen or ibuprofen instead for fever and pain.
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Pediatric Poisoning
Iron is the #1 cause of poisoning death in children under 6 — and it's in every home.
Iron Poisoning
- #1 cause of fatal poisoning in children under 6
- Children's vitamins with iron look like candy → accidental ingestion
- Phases of iron toxicity:
- Phase 1 (0–6 hrs): GI symptoms — vomiting, diarrhea, abdominal pain, bloody stools
- Phase 2 (6–24 hrs): Deceptive improvement — child may look better (the "quiet phase"). Do NOT send home.
- Phase 3 (12–48 hrs): Systemic toxicity — metabolic acidosis, shock, liver failure, coagulopathy → can be fatal
- Antidote: Deferoxamine (chelation therapy) — turns urine red/orange (expected)
- Prevention: Store all iron-containing products in childproof containers OUT OF REACH. This is the #1 teaching point.
Lead Poisoning
- Sources: old paint chips (pre-1978 homes), contaminated water, imported toys, soil
- Children <6 are most vulnerable (hand-to-mouth behavior, developing nervous system)
- Signs: developmental delays, behavioral changes, abdominal pain, constipation, anemia, learning difficulties, lead lines on gums (Burton's lines)
- Screening: blood lead level. CDC reference: ≥3.5 mcg/dL requires action
- Treatment: Chelation therapy — succimer (DMSA) PO for moderate levels; CaNa₂EDTA IV for severe levels
- Priority: remove the child from the source of exposure
General Poisoning Safety
- Call Poison Control: 1-800-222-1222 (know this number)
- Do NOT induce vomiting unless specifically instructed by Poison Control (syrup of ipecac is no longer recommended)
- Bring the container/product to the ED if possible
- Activated charcoal may be used for some ingestions (binds the toxin in the GI tract) — NOT for caustic substances, iron, or lithium
- Childproof all medications and chemicals in the home
The "Quiet Phase" of Iron Poisoning
Phase 2 of iron toxicity is dangerous because the child appears to improve — parents and even providers may think the crisis is over. But this is a deceptive calm before the storm. Phase 3 (systemic toxicity) follows with shock and liver failure. Never discharge a child who has ingested iron during the improvement phase.
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Vaccine Schedule Highlights
You won't need to memorize the entire schedule — but know the key vaccines and when they're given.
Birth Vaccines
- Hepatitis B (HepB) — first dose given within 24 hours of birth (series of 3)
- Erythromycin eye ointment — applied to all newborns to prevent ophthalmia neonatorum (gonococcal conjunctivitis). Not a vaccine but a universal prophylactic.
- Vitamin K (phytonadione) — IM injection at birth to prevent hemorrhagic disease of the newborn (newborns lack clotting factors). Given in the vastus lateralis.
Key Vaccines by Age
- Birth
- HepB #1
- 2 months
- DTaP, IPV, Hib, PCV, RV, HepB #2
- 4 months
- DTaP, IPV, Hib, PCV, RV
- 6 months
- DTaP, PCV, RV, HepB #3, Influenza (start annually)
- 12–15 months
- MMR #1, Varicella #1, HepA #1, Hib booster, PCV booster
- 4–6 years
- DTaP #5, IPV #4, MMR #2, Varicella #2 (school entry)
- 11–12 years
- Tdap, HPV (series), Meningococcal (MenACWY)
PCV = pneumococcal conjugate vaccine (current products are PCV15 or PCV20). This is a simplified schedule — always verify against the current CDC/ACIP immunization schedule.
Vaccine Contraindications (Must Know)
- Live vaccines (MMR, Varicella, Rotavirus, nasal flu) are contraindicated in immunocompromised patients (HIV with low CD4, chemo, high-dose steroids, organ transplant)
- Severe allergic reaction to a previous dose or vaccine component → do NOT give that vaccine again
- Moderate to severe acute illness with fever → delay vaccination until recovered (mild illness with low-grade fever is NOT a contraindication)
- MMR and Varicella: avoid pregnancy for 4 weeks after vaccination (live vaccines)
Post-Vaccine Teaching for Parents
- Mild fever, redness, and soreness at injection site are NORMAL
- Give acetaminophen or ibuprofen (≥6 months) for discomfort
- Report: high fever (>104°F), inconsolable crying >3 hours, seizures, severe allergic reaction
- Stay in the office 15–30 minutes after vaccination to monitor for anaphylaxis
Exam Tip
If a question asks "which child should NOT receive the MMR vaccine?" → the answer is the immunocompromised child (MMR is a live vaccine). A child with a mild cold and low-grade fever CAN still receive vaccines — mild illness is NOT a contraindication. This is a common exam distractor.
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Drugs Contraindicated or Used with Caution in Children
Know which adult drugs cannot be given to pediatric patients.
- Aspirin (under 19)
- Reye syndrome (with viral illness). Use acetaminophen, ibuprofen (≥6 mo) instead.
- Codeine (under 12)
- FDA Black Box: respiratory depression/death (ultra-rapid metabolizers). Use acetaminophen, ibuprofen, non-opioid analgesics instead.
- Tetracycline (under 8)
- Permanent tooth discoloration, bone growth inhibition. Use amoxicillin, azithromycin instead.
- Fluoroquinolones (under 18)
- Cartilage damage, tendon injury in developing joints. Use other appropriate antibiotics.
- Honey (under 1 year)
- Risk of infant botulism (Clostridium botulinum spores). Do not use as cough remedy in infants.
- Diphenhydramine/OTC cough-cold meds (under 2)
- Risk of CNS depression, seizures, death in young children. Use saline drops, humidifier, fluids for cold symptoms.
- Loperamide/Imodium (under 2)
- Risk of paralytic ileus, CNS effects. Use oral rehydration therapy for diarrhea.
- Metoclopramide (Reglan)
- Higher risk of extrapyramidal symptoms in children. Use ondansetron (Zofran) for nausea.
Codeine in Children — FDA Black Box Warning
Codeine is contraindicated in children under 12 for ANY indication and in children under 18 after tonsillectomy/adenoidectomy. Some children are "ultra-rapid metabolizers" who convert codeine to morphine much faster than expected → life-threatening respiratory depression. Use non-opioid alternatives whenever possible.
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Frequently Asked Questions
Common student questions on this topic.
How are pediatric medication doses calculated?
Almost always weight-based (mg/kg) — never assume adult doses scale by age. Always weigh in kilograms (1 kg = 2.2 lb). Verify the dose is within the safe range (often listed as mg/kg/dose AND mg/kg/day). Round carefully. Have a second nurse double-check all high-alert pediatric calculations (insulin, opioids, chemo, IV electrolytes). Use oral syringes (not household teaspoons) for liquid measurements.
Why are different drug routes safer in different age groups?
Vastus lateralis is the preferred IM site for infants (less risk of nerve injury). Deltoid is acceptable for children > 18 months. Avoid the dorsogluteal site — sciatic nerve risk. Oral route with droppers or syringes for infants; flavored liquids or chewables for toddlers. Avoid crushing extended-release medications. Rectal route may be used for vomiting children (acetaminophen, antiepileptics).
What drugs are contraindicated or restricted in children?
Common restrictions: Aspirin — Reye syndrome in viral illness; rarely used in pediatrics except for Kawasaki disease. Tetracyclines — tooth staining, contraindicated < 8 years. Fluoroquinolones — cartilage damage; restricted use. Codeine — FDA warning, fatal respiratory depression in some children (ultra-rapid metabolizers); avoid in < 12 years. Promethazine — black box for respiratory depression in < 2 years.
What is the difference between giving liquid medication to an infant vs a toddler?
Infant: use an oral syringe, place between the gum and cheek (buccal pouch), give small amounts slowly to prevent aspiration. Hold infant upright or semi-upright. Toddler: may use a medicine cup or syringe; let them have some control ("do you want to drink it or use the syringe?"). Never call medicine "candy." If a child spits it out, do not redose unless you know exactly how much was taken.
How do I administer ear drops to a child correctly?
Children under 3 years: pull the pinna down and back. Children 3 years and older (and adults): pull the pinna up and back. Have the child lie on the unaffected side. Warm the drops to body temperature by rolling in hands. Place the prescribed number of drops, then have the child remain on side for 2–5 minutes. Gently press the tragus to push drops in. Don't insert the dropper into the ear canal.
What is the difference between oral and rectal acetaminophen dosing?
Both oral and rectal acetaminophen are 10–15 mg/kg/dose every 4–6 hours, max 5 doses or 75 mg/kg/day (whichever is less; max 4 g for adolescents). Rectal absorption is variable and may be slower. Use rectal route when the child is vomiting or cannot swallow. Both work for fever and mild-moderate pain. Always confirm correct concentration (infant drops vs children's liquid have different strengths historically — now standardized).
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Quick-Reference Cheatsheet
Every key point from this guide on a single printable page.
Pediatric Medication Safety Cheatsheet
One-page PDF — free download.