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Table 2 Plasmatic concentration of morphine and its metabolites in the foal (ng/ml)

From: Morphine plasmatic concentration in a pregnant mare and its foal after long term epidural administration

Days (from birth)

Morphine

M3G

M6G

0

2.40

6.71

< 0.14

1

1.48

10.13

< 0.14

2

< 0.03

3.11

< 0.14