Table 3 Pharmacokinetic values (mean ± SD) for codeine and codeine 6-glucuronide (C6G), morphine, morphine 3-glucuronide (M3G), and morphine 6-glucuronide (M6G) after a single oral administration of codeine (0.6 mg/kg) to horses. Parameters are sorted by predicted phenotypic groups

257.72 ± 122.93^b,c

76.49 ± 46.35^a,c

20.84 ± 6.33^a,b

500.15 ± 249.83

630.12 ± 331.76

523.38 ± 209.18

27.46 ± 9.14

30.82 ± 10.26

34.66 ± 6.31

2700.64 ± 892.03^c

3277.89 ± 935.74

3904.93 ± 987.01^a

98.25 ± 32.76^b,c

170.32 ± 71.02^a

180.92 ± 65.70^a

0.089 ± 0.027^b,c

0.022 ± 0.011^a,c

0.0095 ± 0.001^a,b

0.711 ± 0.596^b,c

0.153 ± 0.137^a

0.045 ± 0.020^a

1.32 ± 0.56

2.50 ± 1.37

2.24 ± 0.88