Pediatric Pharmacology 101: Key Concepts for Safe Medication Administration

Understanding Pediatric Pharmacology

• 💡 Pediatric pharmacology is distinct from adult pharmacology because children are not simply small adults; their bodies process medications differently.
• ⚠️ Most medications given to children lack specific pediatric studies, leading to more variable and dynamic responses and potentially unique adverse reactions.

Absorption Considerations in Children

• 📈 Gastric pH in children is variable, generally neutral at birth and becoming more acidic over time, impacting medication absorption like penicillin.
• 💧 Bile secretion is suboptimal in the first few weeks of life, affecting the absorption of poorly soluble drugs.
• ⏳ Intestinal permeability is high at birth and decreases, while gastric emptying times are delayed in newborns, leading to erratic PO medication absorption.
• 🩹 Intramuscular and subcutaneous absorption can be unpredictable due to variable blood flow in neonates, potentially causing delayed or rapid absorption.
• 🧴 Topical absorption is enhanced in children due to thinner skin and a larger body surface area relative to size, increasing the risk of systemic toxicity.
• 🧠 The blood-brain barrier is immature in young children, making them more susceptible to pronounced central nervous system (CNS) side effects from medications.

Distribution and Metabolism in Pediatric Patients

• 💧 Newborns have a higher total body water (around 80%) compared to adults (60%), requiring higher doses of hydrophilic drugs and having a decreased volume of distribution for lipid-soluble drugs.
• ⚖️ Immature livers in infants younger than six months lead to decreased plasma proteins, resulting in higher levels of unbound drugs and an increased risk of toxicity.
• ⏳ Drug metabolism varies significantly, especially in the first year of life, and is influenced by rapid physiological changes like prematurity, puberty, and rapid growth.

Excretion and Medication Safety

• 📉 The renal system in newborns has a lower Glomerular Filtration Rate (GFR), leading to slower drug excretion and requiring careful monitoring and adjustment of dosages for medications relying on renal clearance.
• ✅ Medication calculations are critical, requiring accuracy in doses per kilogram and proper division of daily allotments.
• 💊 Oral medication administration can be challenging; using oral syringes and involving parents can improve compliance, while mixing medications requires care to ensure full dosage is consumed.
• 👁️ When administering eye drops, pressure on the nasolacrimal duct prevents systemic absorption.
• 👂 For ear drops, the pinna should be pulled down and back.
• 💉 IM injections require careful consideration of absorption variability and patient trust, with options like Emla cream to manage pain, but honesty about potential discomfort is crucial.
• 🏥 IV fluid and medication administration in children requires precise monitoring using devices like Volurols or syringe pumps to prevent fluid overload and ensure accurate dosing, especially for high-risk medications.
• 🩹 Applying an occlusive dressing over topical medications, including in the diaper area, can significantly increase absorption and should be avoided if possible.

Key Takeaways for Safe Practice

• ⚠️ Pharmacokinetics in children are highly variable and depend on numerous factors, necessitating triple-checking all medication doses.
• 🤝 Building trust and employing creativity are essential for medication compliance, often depending on the child's developmental age and parental involvement.
• ✨ Pediatric nursing offers a unique and inspiring experience, with children often demonstrating remarkable resilience and a positive outlook despite illness.