The neonate is not a small adult —
and not even a small child.

Between 24 weeks of gestation and 2 years of age the body changes its composition, its liver enzymes and its kidney function more than at any other time of life. Every dosing rule in neonatal practice is a consequence of that. This guide makes the consequence visible: move the baby, and watch the dose, the interval and the concentration curve move with it.

Built from Pharmacology in Neonates — coursework notes, 1st & 2nd editions Checked against Lippincott Illustrated Reviews 6e + Thieme Illustrated Review — 382 indexed chunks, page-anchored (§12) Neonatal values from NeoFax 2020 · Cloherty & Stark 8e · AIMS NICU Manual
01 — Part 1 · Physiology

The maturation engine

Six curves generate every neonatal dosing rule you will ever meet. Water and extracellular fluid fall; fat, glomerular filtration, albumin and conjugating enzymes rise — each on its own timetable. Set a baby below and read what follows.

Water makes the dose. Kidney makes the interval.
Grounded in Lippincott 6e · IV. Drug distribution · pp. 23–25 V. Clearance through metabolism · pp. 26–29 VI. Clearance by the kidney · p. 30 VIII. Design & optimization of dosage regimen · pp. 32–35 Thieme · ch. 1 Pharmacokinetics ch. 3 Pharmacogenetics & special considerations Neonatal values: NeoFax 2020 · Cloherty 8e — see §12

Set the infant

PMA = gestational age + postnatal age — the primary determinant of clearance
28weeks
5days
1.05kg
Postmenstrual age
28.7 wk
Total body water
83 %
GFR maturation
11 % adult
Weight category
ELBW
Total body water (% body wt) Extracellular fluid (% body wt) Body fat (% body wt) GFR (% adult, Rhodin) Albumin (% adult) Glucuronidation (% adult)
GFR maturation is the Rhodin sigmoid, TM50 = 47.7 weeks PMA, Hill = 3.4 — which computes to 35.4 % at 40 weeks, against the 35 % the source paper reports. Body-composition curves interpolate the notes' own anchor values (86 % water at 24 weeks, 75 % at term, 60 % adult).

What that infant should receive

NeoFax interval chart
Dose
20 mg/kg
Interval
q12h
Per dose
21 mg
Daily
40 mg/kg/d
Est. half-life
3.8 h

The patternThe mg/kg dose stays roughly constant across gestations; it is the interval that is indexed to postmenstrual age. Ampicillin, penicillin G, nafcillin, oxacillin, clindamycin and piperacillin–tazobactam all share one interval table — learn it once and you have learned six drugs.
Half-life: the whole argument in one table
DrugPreterm neonateTerm neonateAdultWhat follows
Gentamicin8–12 h4–6 h2–3 hInterval 24–48 h, indexed to PMA
Ampicillin / penicillin G3–5 h2–3 h≈1 hq12h in week 1, q8h thereafter
Vancomycin6–10 h4–6 h4–6 hInterval 6–18 h by PMA; troughs mandatory
Meropenem3.82 h1.58 h≈1 hq12h if <32 wk and <14 d; else q8h
Caffeine50–100 h40–70 h≈5 hOnce daily; CYP1A2 is last to mature
Fluconazole30–90 h25–30 h≈25 hq48h for 2 weeks, then q24h
Metronidazole20.5 h16.7 h≈8 hThe interval chart stretches to q24h at 24–25 wk
Pitfall — the creatinine trapSerum creatinine in the first days of life is largely maternal, having crossed the placenta. In the more preterm infant it may even rise transiently from tubular back-leak. A "normal" creatinine on day 1 tells you about the mother's kidneys. In the first week, use gestational age — not creatinine — to choose the interval of a renally cleared drug.
02 — Part 1 · §1.2 & §1.9

Only two parameters are real

Loading dose comes from volume of distribution. Maintenance rate comes from clearance. Half-life is derived from those two, never the other way round — which is why a long half-life can mean either wide distribution or slow elimination, with different clinical consequences.

Grounded in Lippincott 6e · ch. 37 IV. Determinants of rational dosing · p. 490 ch. 39 IV. Aminoglycosides · pp. 517–518 ch. 38 II. Penicillins · pp. 497–501 Thieme · ch. 28 Principles of antimicrobial therapy
From V_d

Loading dose = Vd × target

How big the dose is. Neonatal Vd of a water-soluble drug is larger, so the mg/kg dose is larger. Gentamicin Vd ≈ 0.5 L/kg against 0.25 in an adult — that alone is why a neonate gets 4–5 mg/kg.

From CL

Maintenance rate = CL × target

How much per unit time. Neonatal clearance is smaller, so the interval is longer. Only the first dose comes from Vd; at steady state the regimen is governed entirely by clearance.

Derived

t½ = 0.693 × Vd ÷ CL

How far apart doses can be, and how long steady state takes (4–5 half-lives). In the neonate Vd is up and CL is down — both push half-life the same way, which is why neonatal half-lives are long.

Concentration over one steady-state interval

One-compartment, IV infusion, steady state — driven by the infant set in §01
0.5h
2mg/L
100% of chart dose
Cmax steady state
—
Cmin (trough)
—
% fT > MIC
—
Target
—

Clearance is derived from the notes' documented neonatal half-lives interpolated across PMA, and Vd from the NeoFax values quoted in §1.3. This is a teaching model of the right shape and magnitude — not a dosing calculator.
Concept — the two ideas that complete the picturePost-antibiotic effect is long for aminoglycosides against Gram-negative bacilli (the second justification for once-daily dosing) and essentially absent for β-lactams against Gram-negatives (the second reason they must be given often). MIC vs MBC: when MBC ≫ MIC the organism is tolerant. In neonatal meningitis, host defences cannot finish the job — which is the pharmacological justification for high-dose β-lactam therapy.
IndexKillingDrugsDosing consequence
Cmax/MICConcentration-dependent; target ratio 8–10Aminoglycosides, daptomycin, colistin, metronidazole, amphotericin BOne large dose at a long interval. Maximises the peak and allows a low-concentration window that limits toxicity.
T > MICSaturates above ≈4× MICAll β-lactams (penicillins ≈50 %, cephalosporins 60–70 %, carbapenems ≈40 %), clindamycin, linezolid, flucytosineDivide the same daily dose more often, or extend the infusion to 3–4 h. Raising the peak achieves nothing.
AUC₀₋₂₄/MICTotal exposureVancomycin (≥400), fluoroquinolones, azithromycin, tetracyclines, fluconazole, echinocandinsOnly the daily exposure matters; the schedule is then chosen for convenience and safety.
03 — Part 3 · the chart behind six drugs

Why every neonatal chart is a table of intervals

Larger Vd raises the mg/kg dose; smaller clearance lengthens the gap. That is the entire structure of the standard NeoFax β-lactam chart — and the live cell below is the one your infant from §01 falls into.

Postmenstrual agePostnatal ageIntervalApplies to
≤ 29 wk0–28 dq12hAmpicillin · penicillin G · nafcillin · oxacillin · cloxacillin · cefazolin · ceftazidime · aztreonam · clindamycin · piperacillin–tazobactam
≤ 29 wk> 28 dq8h
30–36 wk0–14 dq12h
30–36 wk> 14 dq8h
37–44 wk0–7 dq12h
37–44 wk> 7 dq8h
≥ 45 wkallq6h
Neonatal pearlNeoFax also applies the ≤ 29-week column to any infant with significant asphyxia, a patent ductus arteriosus, or treatment with indomethacin — all of which reduce renal blood flow. Prolong the amikacin interval by 10 hours with ibuprofen, and in therapeutic hypothermia (which cuts amikacin clearance by 40.6 %).
04 — Part 2 · §2.4 Pathophysiology

The sepsis cascade, one stage at a time

This is the section that separates a good answer from an average one. Work through it in seven steps: how the organism arrives, why the host cannot stop it, what the alarm does, what happens to the blood-vessel lining, how organs fail, and what follows the storm.

Infection → SIRS → MODS → immunoparalysis

Step through, or press Play
1 · Arrival Transplacental — Listeria Ascending — the EOS route Intrapartum — GBS Horizontal — hands, lines ≤72 h vertical · >72 h horizontal 2 · Recognition Bacterium PAMP — LPS, lipoteichoic acid TLR-4 · TLR-2 3 · The switch MyD88 NF-κB nucleus — genes switch on 4 · The shout TNF-α IL-1β IL-6 IL-8 Cytokines do not stay where the germ is — they flood the circulation. Infection becomes sepsis. 5 · The endothelium — the pivotal event vessel lumen — normally smooth, non-stick, watertight Sticky selectins, ICAM-1 — neutrophils glue on and never migrate Dilated iNOS → nitric oxide → vasoplegia, blood pressure falls Leaky capillary leak — puffy baby, empty vessels, BP falls despite fluid Clotting TF exposed, thrombomodulin shed → DIC (see §05) 6 · MODS Kidney — anuria Liver — failure Gut — ischaemia Brain — encephalopathy Lung — stiff, PPHN Blood pressure is a LATE sign — judge perfusion, not BP 7 · Immunoparalysis IL-10 ↑ TGF-β ↑ HLA-DR ↓ lymphocyte apoptosis The baby is now defenceless — second infection, often fungal Why this host cannot contain it Barriers broken Skin paper-thin before 32 wk; almost no gastric acid; and we breach every barrier deliberately — tube, line, needle. Fire brigade understaffed Neutrophil storage pool small and exhausted in hours — so ANC < 1000 is a BAD sign. Complement 50–75 % of adult. No memory, no antibody Maternal IgG crosses mainly after 32 wk; the infant makes no IgM or IgA — so cord IgM implies intrauterine infection. Net effect: the neonate cannot LOCALISE infection. A boil becomes bacteraemia; bacteraemia becomes meningitis. That is why any suspicion is a whole-body emergency, and why you always look for meningitis.
The cascade from arrival to immunoparalysis. The endothelium is the pivot: everything upstream of it is recognition, everything downstream is a consequence of a lining that has become sticky, dilated, leaky and thrombogenic at once.
Concept — two neonatal peculiarities that explain therapeutic failureThe neonatal cytokine response is skewed, not simply reduced: TLR signalling produces relatively high IL-6 and IL-23 but low TNF-α and interferon-γ — poorly bactericidal, yet still capable of capillary leak and shock. And the illness is biphasic. That is why anti-inflammatory strategies alone (anti-TNF agents, high-dose steroids) have failed in trials.
05 — Part 2 · §2.4(e)

Clotting, from scratch — and why the newborn decompensates so fast

Blood must stay liquid inside vessels and turn solid instantly at a cut. There is an accelerator and a brake, permanently balanced. Thrombin is the central character: everything either makes it or stops it — and thrombomodulin is the switch that decides which personality thrombin has.

Normal endothelium — self-limiting intact luminal surface Injury → prothrombin (II) THROMBIN → fibrinogen → FIBRIN mesh + platelets = clot drifts to healthy wall nearby thrombomodulin the switch — thrombin changes personality and stops making clots protein C → APC + protein S, + EPCR ⊣ Va, VIIIa the accelerator pedals Result: the clot stops at the edge of the injury. Inflamed endothelium — DIC thrombomodulin + EPCR SHED from the surface monocyte TF tissue factor now appears EVERYWHERE, not just at injury + VIIa → Xa THROMBIN generated throughout the body thrombomodulin almost no APC is made — and protein S is low, so what little exists works poorly PAI-1 ⊣ plasmin clot dissolving switched OFF Accelerator jammed on · brakes gone · clean-up disabled → thousands of microthrombi block small vessels (organ failure) → platelets, fibrinogen and factors are CONSUMED → the baby bleeds. Clotting everywhere and bleeding everywhere, at the same time. That is DIC. The neonatal amplification — the exam point worth writing Protein C, protein S and antithrombin are already only 30–50 % of adult levels at birth, lower still in the preterm, and vitamin K-dependent factors II, VII, IX, X are low too. The brakes are half-off BEFORE the infection starts. Sepsis then removes what little is left — so DIC and purpura fulminans appear early and severely.
What changes between the two panels is not the cascade but its control: thrombomodulin and EPCR present on the left, shed on the right. That single difference converts a self-limiting clot into disseminated intravascular coagulation.
TestWhat it measuresIn DIC
PlateletsConsumed in the microthrombiLow — often the earliest and most persistent sign
PTExtrinsic + common pathwayProlonged
aPTTIntrinsic + common pathwayProlonged
FibrinogenRaw material for fibrinLow — used up
D-dimer / FDPFragments of broken-down clotHigh — proof clots formed and partly dissolved
High-yieldPersistent, unexplained thrombocytopenia in an infant already on antibiotics should raise the suspicion of fungal sepsis. Note also what is not available: activated protein C was never studied in a randomised neonatal trial and was withdrawn after adult safety concerns.
06 — Part 3 · §3.2 & §3.4–3.7

The mechanism map

An antimicrobial works because it attacks something the microbe has and we do not. The size of that difference predicts the drug's toxicity — which is the whole hierarchy of antimicrobial safety in one idea. Click a target.

Grounded in Lippincott 6e · ch. 37 X. Sites of antimicrobial actions · p. 494 VII. Drug resistance · p. 492 ch. 38 Cell wall inhibitors · pp. 497–508 ch. 39 Protein synthesis inhibitors · pp. 513–526 ch. 40 Quinolones & folate antagonists · pp. 527–536 Thieme · ch. 29 Antibacterial drugs

Where each class binds

Eight targets · click to open
Peptidoglycan cell wall β-lactams · glycopeptides · fosfomycin · bacitracin Cytoplasmic membrane polymyxins (lipid A) · daptomycin 30S aminoglycosides tetracyclines 50S macrolides clindamycin · linezolid · chloramphenicol DNA gyrase / topo IV fluoroquinolones RNA pol β rifampicin — never alone Folate synthesis PABA → DHF → THF sulphonamides · trimethoprim Anaerobic nitro-reduction ferredoxin → nitro radical → DNA strand breaks · metronidazole
Selective toxicity, drawn to scale of risk: humans have no peptidoglycan at all (β-lactams are among the safest drugs known), a 70S-versus-80S ribosome is a large but not absolute difference, and the human mitochondrial ribosome resembles the bacterial one — which is precisely why chloramphenicol and linezolid suppress marrow.
ClassTargetCidal/staticPK/PDCSFMain neonatal toxicity
Penicillinstranspeptidase (PBP)cidalT > MIConly if inflamedhypersensitivity; seizures at high dose; Na⁺/K⁺ load
Cephalosporinstranspeptidase (PBP)cidalT > MIC3rd & 4th gen, goodceftriaxone → kernicterus + calcium precipitate
Carbapenemstranspeptidase (PBP)cidalT > MICmeropenem, goodseizures (imipenem); resistance selection
GlycopeptidesD-Ala–D-Ala substratecidalAUC/MICpoornephrotoxicity; red man syndrome
Aminoglycosides30S ribosomecidalCmax/MICinadequatenephrotoxicity (reversible), ototoxicity (irreversible)
Macrolides50S ribosomestaticAUC/MICpoorpyloric stenosis <6 wk; CYP3A4 inhibition
Clindamycin50S ribosomestaticT > MICpoorC. difficile colitis
Linezolid23S rRNA, 70S initiationstaticAUC/MICgoodthrombocytopenia; neuropathy after 28 d
Chloramphenicol50S peptidyl transferasestaticT > MICexcellentgrey baby syndrome; aplastic anaemia
Co-trimoxazolefolate, two stepscidal (combo)AUC/MICgoodkernicterus; haemolysis in G6PD deficiency
MetronidazoleDNA strand breakscidalCmax/MICexcellentneuropathy with prolonged use
RifampicinRNA polymerasecidalAUC/MICexcellenthepatotoxicity; enzyme induction; orange secretions
Polymyxinslipid AcidalCmax/MICnegligiblenephrotoxicity and neurotoxicity
The anomaly to rememberEvery other inhibitor of protein synthesis is bacteriostatic — but aminoglycosides are bactericidal, because they bind the 30S irreversibly and cause misreading that produces non-functional membrane proteins, which in turn increases further drug uptake. An autocatalytic loop.
Pitfall — three cephalosporin rules, without hesitation1. Ceftriaxone is contraindicated in the neonate — use cefotaxime. 2. No cephalosporin of any generation covers Listeria, Enterococcus or MRSA (except ceftaroline) — which is why ampicillin cannot simply be replaced by cefotaxime. 3. Never use a third-generation cephalosporin against Enterobacter, Serratia, Citrobacter or Providencia even if the disc says sensitive — inducible chromosomal AmpC de-represses on therapy. Use cefepime or meropenem.
07 — Part 5 · §5.1

Why fungi are harder: exactly four differences

Fungi are eukaryotes — nucleus, mitochondria, 80S ribosomes, exactly as we have. Almost every antibacterial target simply does not exist. There are precisely four exploitable differences, and they define the four antifungal classes. That single fact explains why antifungals are systematically more toxic.

Grounded in Lippincott 6e · ch. 42 I. Overview · p. 549 II. Drugs for systemic mycotic infections · pp. 549–556 Thieme · ch. 31 Antifungal & antiparasitic drugs
Difference 1 · cell wall

β(1,3)-D-glucan + chitin

Not peptidoglycan — and mammalian cells have no wall at all. Echinocandins (micafungin, caspofungin) inhibit glucan synthase. The target has no human counterpart, so these are the best-tolerated antifungals — but they penetrate urine, CSF and vitreous poorly, which is the key neonatal limitation.

Difference 2 · membrane sterol

Ergosterol, not cholesterol

Polyenes bind it and punch pores (amphotericin B — fungicidal, broadest spectrum, and CSF penetration of 40–90 % of serum in the preterm neonate). Azoles stop it being made. Binding is not perfectly selective for ergosterol over cholesterol — hence nephrotoxicity.

Difference 3 · uptake enzymes

Cytosine permease + deaminase

Flucytosine is selectively taken in and converted to 5-fluorouracil. Human cells lack cytosine deaminase — but gut bacteria have it, which is how systemic 5-FU is generated and the marrow is suppressed. Never used alone; resistance is rapid.

Difference 4 · fungal CYP

Lanosterol 14-α-demethylase

Azoles inhibit it — though not with perfect selectivity, which is exactly why they also inhibit human CYP3A4 and cause drug interactions. Fluconazole is the least potent inhibitor of the class.

The neonatal decision that matters mostFluconazole is >80 % excreted unchanged in urine — the drug of choice for candiduria and renal candidiasis. Lipid amphotericin formulations are the exact opposite: taken up by the reticuloendothelial system, so they penetrate the urinary tract poorly. Since renal and CNS involvement is the rule rather than the exception in neonatal candidiasis, a lipid formulation is not first-line here. And before any of that: remove the central line within 24 hours — delay is independently associated with persistent candidaemia and death, for every Candida species.
08 — Part 7 · §7.2

Contraindicated or restricted — and the mechanism for each

Marks are earned for the reason, not the list. Each of these is a specific consequence of neonatal physiology from §01.

Mechanism grounded in Lippincott 6e · ch. 39 VII. Chloramphenicol · p. 523 (“gray baby”) ch. 40 IV. Trimethoprim · p. 533 (kernicterus) ch. 40 III. Sulfonamides · pp. 531–532 ch. 39 II. Tetracyclines · pp. 513–515 ch. 39 V. Macrolides · pp. 519–521 ch. 38 VI. Vancomycin · p. 507
Contraindicated

Ceftriaxone

Highly protein-bound — displaces bilirubin from albumin → kernicterus. And it forms an insoluble precipitate with calcium, which has caused fatal pulmonary and renal precipitates. Use cefotaxime. One exception: a single dose for gonococcal ophthalmia in a non-jaundiced infant not receiving calcium.

Contraindicated

Sulphonamides / co-trimoxazole

The historical, best-documented cause of drug-induced kernicterus. Also haemolysis in G6PD deficiency and crystalluria from poorly soluble acetylated metabolites. Exceptions: Pneumocystis, toxoplasmosis, refractory Listeria.

Contraindicated <8 yr

Tetracyclines

Chelate calcium and deposit in calcifying tissue → permanent yellow-brown tooth staining, enamel hypoplasia, depressed bone growth.

Avoid — use only if no alternative

Chloramphenicol

Grey baby syndrome. Inactivated by glucuronidation, then the conjugate is excreted renally — both steps immature. It accumulates, inhibits mitochondrial protein synthesis, and causes vomiting, abdominal distension, ashen-grey cyanosis, hypotension, collapse and death. Plus idiosyncratic aplastic anaemia.

Relative contraindication

Fluoroquinolones

Cartilage erosion in juvenile animals; tendinopathy; QT prolongation. Human neonatal data have not confirmed clinically significant arthropathy — so this is a considered exception for multi-drug-resistant infection, not an absolute bar.

Avoid first 6 weeks

Oral erythromycin

Motilin-receptor agonism → infantile hypertrophic pyloric stenosis, with a ~30-fold increased risk at 0–13 days of age. Use azithromycin for pertussis in this age group for exactly this reason.

Contraindicated

Benzyl alcohol-preserved preparations

Metabolised to benzoic acid, which the neonate cannot conjugate to hippurate → gasping syndrome: metabolic acidosis, gasping respiration, encephalopathy, seizures, intraventricular haemorrhage, collapse, death. Benzoate also displaces bilirubin. Use preservative-free.

Caution

Propylene glycol vehicles

In IV lorazepam, phenytoin, phenobarbitone, some digoxin and multivitamin preparations: hyperosmolality, raised anion-gap lactic acidosis, seizures, arrhythmia, haemolysis, nephrotoxicity.

Used, but monitored

Aminoglycosides

Nephrotoxicity is reversible; ototoxicity is not. A mitochondrial 12S rRNA A1555G mutation causes profound, dose-independent deafness after a single dose — ask about a maternal family history of deafness after antibiotics.

Pitfall — the subtlety examiners likeIn a mature patient, displacement from albumin is usually self-correcting, because the freed drug is cleared faster. In the neonate that compensating clearance is not there, so the free concentration stays high. Displacement matters far more in the newborn than at any other age.
09 — Part 1 §1.10 · Part 7 §7.6

Therapeutic drug monitoring

TDM is justified when four conditions hold together: a narrow therapeutic index, wide unpredictable variability, a measurable concentration that tracks effect or toxicity, and no easy clinical end-point. The neonate satisfies the first two for almost every drug — which is why TDM is used far more here than in adult practice.

DrugPeakTroughWhy
Gentamicin / tobramycin5–12 mg/L (Cmax/MIC > 8:1)0.5–1 mg/LPeak drives efficacy; trough drives nephro- and ototoxicity. Measure if therapy exceeds 48 h.
Amikacin20–35 mg/L< 3–8 mg/LAs above. Avoid prolonged peaks above 35.
Vancomycin—10–15 mg/L; 15–20 for meningitis, osteomyelitis, endocarditisTrough, not peak, tracks both efficacy and AKI. 15 mg/kg hit a 10–20 trough in only ~74 % of infants; 10 mg/kg in 14 %.
Flucytosine50–80 µg/mL—Marrow suppression above 100 µg/mL. Amphotericin-induced renal impairment raises levels — the price of the synergy.
Chloramphenicol15–25 mg/L5–15 mg/LGrey baby syndrome; dose-related marrow suppression.
Phenobarbitone—15–40 mg/LLong half-life, wide variability.
Phenytoin—total 10–20 mg/L, free 1–2 mg/LProtein-binding displacement makes total levels unreliable; kinetics are saturable.
Caffeine citrate—5–25 mg/LVery long half-life, wide index — levels rarely needed.
Pitfall — the three commonest TDM errors in a neonatal unit1. Taking the trough from the same line the drug went through — contamination gives a spuriously high result and leads to under-dosing. 2. Taking the "peak" too early, before distribution is complete — which is why vancomycin uses troughs. 3. Recording the wrong time on the request form, which makes any interpretation impossible. Always document the exact time of the dose and the sample.
The in-vitro trapAminoglycosides are inactivated by penicillins in the same syringe or line — the β-lactam ring opens and acylates the aminoglycoside. The same reaction happens inside the sample tube, falsely lowering a measured level in a specimen that also contains a penicillin. Give them separately, flush between, and spin and freeze TDM samples promptly.
10 — active recall

Self-test

Twenty questions drawn from the notes' own high-yield one-liners. Answer, then read why — recall beats re-reading.

Question 1 of 20

0 correct
12 — provenance

Where each claim on this page comes from

This guide was first written from the coursework notes alone. It has since been checked against two general pharmacology textbooks, chunked and indexed into a searchable knowledge base — 382 chunks · 3.20 M characters · 914 figures. The checking turned up something worth stating plainly, because it decides what you can cite for what.

Tier 1 · mechanism

Lippincott Illustrated Reviews: Pharmacology, 6e

680 pages → 347 section chunks, split on the book's own outline. Every mechanism claim on this page — β-lactams acylating the transpeptidase, aminoglycosides being the one bactericidal protein-synthesis inhibitor, amphotericin B binding ergosterol, gray baby syndrome — is verifiable here, page-anchored. Cited inline above.

Tier 2 · mechanism, second reading

Pharmacology — An Illustrated Review (Thieme, Simmons 2011)

35 chapter chunks, 203 figures. Used as an independent second statement of the same mechanisms — where the two books agree, the claim is safe; where the emphasis differs, the difference is worth knowing.

Tier 3 · everything neonatal

NeoFax 2020 · Cloherty 8e · AIMS NICU Manual

Reached through the coursework notes, not through the two textbooks. Every dose, every PMA interval, every neonatal Vd and half-life on this page belongs to this tier.

The boundary is itself the findingSearching both general textbooks for neonat* and newborn returns almost nothing: 6 mentions in Thieme's chapter 3 (Pharmacogenetics and Other Special Considerations), 4 in its antibacterial chapter, and single mentions scattered across five Lippincott sections. These books do not teach neonatal dosing. They give you the mechanism; the neonate is a separate literature. So: cite Lippincott for why ceftriaxone displaces bilirubin, and NeoFax for what to give instead and how often — and never the reverse.
What the knowledge base is, and is notIt is 382 indexed chunks with page anchors and a 201-node directed concept graph, whose edges each carry the sentence they were extracted from. It is not a co-occurrence graph: in the penicillins chunk, nine sentences mention both a drug and a target, but only two of them assert a relationship — and only those two became edges. A graph that counted the other seven would look richer and be worse.
11 — reference

Every abbreviation, in plain words

GA gestational age — completed weeks from the last menstrual period to birth
PNA postnatal age — days since birth
PMA postmenstrual age — GA + PNA; the best single predictor of clearance
LBW / VLBW / ELBW under 2500 g / 1500 g / 1000 g
EOS / LOS early- / late-onset sepsis — within 72 h, from mother; after 72 h, from the ward
GBS Group B Streptococcus — lives harmlessly in many women; can kill a newborn
CONS coagulase-negative staphylococci — ordinary skin germs; dangerous on a line
PAMP pathogen-associated molecular pattern — a molecule only germs have: the "smell" of a germ
PRR / TLR pattern-recognition receptor / Toll-like receptor — the smoke detectors
LPS lipopolysaccharide (endotoxin) — the outer coat of Gram-negatives; the strongest alarm there is
NF-κB the master switch inside the cell; alarm flips it, inflammation genes turn on
MyD88 the wire from the smoke detector to the switch
TNF-α, IL-1β, IL-6, IL-8 cytokines — the chemical shouts that call for help
IL-10, TGF-β the calming cytokines that say "stand down"
iNOS / NO the enzyme and the gas that relax vessels — blood pressure falls
ICAM-1, selectins Velcro on the vessel wall that white cells stick to
DIC disseminated intravascular coagulation — clotting gone haywire everywhere at once
PT / aPTT two tests of how long blood takes to clot
TF tissue factor — the "start clotting" signal
APC activated protein C — a natural brake on clotting
EPCR endothelial protein C receptor — the docking station that helps APC work
TM thrombomodulin — the switch that turns thrombin from clot-maker into clot-stopper
PAI-1 plasminogen activator inhibitor 1 — blocks clot dissolving
SIRS / MODS whole-body inflammation / several organs failing together
ANC absolute neutrophil count — the main infection-fighting white cells
I:T ratio immature-to-total neutrophils — how many are "unripe" — a marrow running out
HLA-DR a monocyte surface marker; low = the immune system has gone flat
IgG / IgM / IgA antibodies. IgG crosses the placenta; IgM and IgA do not
PPHN persistent pulmonary hypertension of the newborn — lung vessels stay clamped shut
MIC / MBC lowest concentration that inhibits growth / that kills 99.9 %
Vd / CL / t½ volume of distribution / clearance / half-life
UGT / SULT glucuronidation (most deficient at birth) / sulphation (partly compensates)
ESBL / AmpC plasmid β-lactamase (clavulanate-inhibited) / chromosomal, inducible, not inhibited
PBP / mecA / PBP2a penicillin-binding protein; the gene and product that make MRSA
IAP intrapartum antibiotic prophylaxis — penicillin ≥4 h before delivery counts; clindamycin does not
CLABSI central-line-associated bloodstream infection
NEC necrotising enterocolitis
TDM therapeutic drug monitoring
Content assembled from Pharmacology in Neonates — Coursework Notes, 1st and 2nd editions, which cite Cloherty & Stark's Manual of Neonatal Care 8e (ch. 48–49), NeoFax / Micromedex Essentials 2020, the AIMS NICU Manual, Rowland & Tozer, and Lippincott Illustrated Reviews: Pharmacology.

The simulators are teaching models built on the neonatal Vd and half-life values documented in those notes; they show the right shape and magnitude and nothing more. Every dose must be confirmed against the current NeoFax monograph and the local unit protocol before prescribing.