Reference — Neonatal
Newborn Medications Reference
Three medications are routine in the first hours of life. Each prevents a specific, serious problem — and each comes with predictable parent questions nurses should be ready to answer.
Data Source: AAP Recommendations / CDC Immunization Schedule
Educational use only. Administration follows provider orders, parental consent processes, and your facility’s newborn protocols. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
The Routine Three
| Medication | Prevents | Route and Site | Timing |
|---|---|---|---|
| Vitamin K (phytonadione) | Vitamin K deficiency bleeding (hemorrhagic disease of the newborn) | IM — vastus lateralis | Within 1–6 hours of birth |
| Erythromycin 0.5% ophthalmic ointment | Ophthalmia neonatorum (gonococcal conjunctivitis) | Thin ribbon to lower conjunctival sac of each eye | Within 1–2 hours of birth (may delay slightly for bonding per policy) |
| Hepatitis B vaccine (first dose) | Perinatal hepatitis B transmission | IM — vastus lateralis (opposite leg from vitamin K) | Within 24 hours of birth; plus HBIG within 12 hours if mother is HBsAg-positive |
Why Each Matters (Parent Teaching)
Vitamin K
Newborns have essentially no vitamin K stores and a sterile gut that cannot yet make it — without the injection, rare but devastating bleeding (including intracranial) can occur up to months later. One injection covers the gap.
Erythromycin ointment
Protects against blinding eye infection from bacteria that can be present in any birth canal. It may blur vision briefly and does not hurt; do not wipe it away.
Hepatitis B vaccine
Birth-dose vaccination is the safety net against a virus that, when caught at birth, becomes chronic in up to 90% of infants. If the mother is HBsAg-positive, HBIG is added within 12 hours.
NCLEX Pearls
- ✦Vastus lateralis is the IM site for newborns — never the dorsogluteal.
- ✦Vitamin K is one-time prophylaxis; hepatitis B is dose one of a series.
- ✦HBsAg-positive mother = vaccine plus HBIG within 12 hours, different sites.
- ✦Erythromycin is applied to the conjunctival sac, inner canthus outward — and not rinsed or wiped off.
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with American Academy of Pediatrics (AAP) · Neonatal Resuscitation Program (NRP) · AWHONN. It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →