Table B. Raltegravir Pharmacokinetic Parameters for Raltegravir-Naive and Raltegravir-Exposed Neonates

Body
Table B. Raltegravir Pharmacokinetic Parameters for Raltegravir-Naive and Raltegravir-Exposed Neonates
PK Parameter Initial Dose:
RAL 1.5 mg/kg Once Daily
RAL-Naive
(n = 25)d		 Initial Dose:
RAL 1.5 mg/kg Once Daily
RAL-Exposed
(n = 10)		 Days 15–18:
RAL 3.0 mg/kg Twice Daily
RAL-Naive
(n = 24)e		 Days 15–18:
RAL 3.0 mg/kg Twice Daily
RAL-Exposed
(n = 10)f
GM (CV%) Target GM (CV%) Target GM (CV%) Target GM (CV%) Target
AUC0–24h
(mg·h/L)a		 38.2 (42.0%) Met: 13
Above: 11
Below: 0		 42.9 (25.3%) Met: 4
Above: 6
Below: 0		       -------     ---------       --------       -------
 AUC0–12h
(mg·h/L)		      --------      --------        ---------  --------  14.3 (49.5%) Met: 14
Above: 8
Below: 1

 18.3 (62.8%)

 Met: 3
Above: 5
Below: 1
Ctrough
(ng/mL)b		 948 (84.0%) Above: 25
Below: 0		 946 (74.0%) Met: 10
Above: 0		 176 (162.1%) Above: 22
Below: 1		 274 (176.4%) Above: 8
Below: 2
Cmax
(ng/mL)c		 2,350 (36.5%) Below: 25
Above: 0		 2,565.3 (23.1%) Met: 10
Above: 0		 2,849 (47.5%) Below: 24
Above: 0		 3,667 (46.3%) Met: 9
Above: 0
Tmax
(hours)		 5.4 (71.5%) N/A 3.8 (88.8%) N/A 2.3 (77.1%) N/A 1.9 (52.3%) N/A
T½
(hours)		 15.8 (101.4%) N/A 14.4 (69.5%) N/A 2.5 (34.1%) N/A 2.9 (20.7%) N/A
a AUC targets: AUC0–24h 12–40 mg·h/L and AUC0–12h 6–20 mg·h/L.
b Ctrough concentration >33 ng/mL. For initial dose, Clast collected at 24 hours was used. For Days 15–18, C12h was estimated when the 12 hours post-dose sample was collected earlier than 12 hours after dosing (the protocol specified a sample collection time of 8–12 hours post dose).
c Cmax <8,724 ng/mL.
d AUC0–24h could not be estimated for one infant.
e AUC0–12h and Ctrough could not be estimated for one infant with delayed absorption.
f AUC0–12h and Cmax could not be estimated for one infant with incomplete sample collection.

Key: AUC = area under the curve; Clast = last measurable plasma concentration; Cmax = maximum concentration; Ctrough = trough concentration; CV = coefficient of variation; GM = geometric mean; PK = pharmacokinetic; RAL = raltegravir; T1/2 = half-life; Tmax = time to reach maximum concentration