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Table 1 Characteristics and peak recorded serum APAP-CYS concentrations for subjects administered 4 g/day of acetaminophen during three clinical trials.

From: Acetaminophen-cysteine adducts during therapeutic dosing and following overdose

 

Study

 

Trial 1

Trial 2

Trial 3

Subjects

Non-drinkers

Moderate drinkers

Alcoholics

Duration of dosing

10 d

10 d

5 d

Days of sampling

0, 4, 7, 9, 11,14

0,11

0, 2, 4, 6,7

n

24

91 APAP

47 placebo

40 APAP/

7 placebo

Median age (range) years

34.5 (23 to 63)

30 (21 to 64)

46 (33 to 66)

Male

7 (29%)

47 (52%)

39 (98%)

ALT

   

Baseline ALT

Median (Range) IU/L

24 (14 to 45)

19 (11 to 49)

29 (10 to 178)

Peak ALT

Median (Range) IU/L

45 (19 to 136)

25 (14 to 128)

47.5 (8 to 238)

ALT >ULN during study

n (%)

14 (58%)

17 (19%)

24 (60%)

Peak Serum APAP-CYS

   

   Mean (SD) nmol/L

0.4 (0.20)

0.1 (0.09)*

0.3 (0.12)

   Range nmol/L

0.1 to 1.0

0.0 to 0.5

0.1 to 0.8

  1. Trial 1 included non-drinkers treated for 10 days, Trial 2 included moderate drinkers treated for 10 days and Trial 3 included alcoholic subjects treated for five days. APAP-CYS-Acetaminophen-cysteine adducts, ALT-alanine aminotransferase, ULN-upper limits of normal for the test. SD-standard deviation.
  2. *p < 0.001 vs Trial 1 and 3