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. 2008 Feb 20;65(5):661–666. doi: 10.1111/j.1365-2125.2008.03117.x

Figure 1.

Figure 1

Milk (•) and plasma (○) concentration–time observations for rac-tramadol (A) and rac-O-desmethyltramadol (B) following the fourth or later 100 mg oral dose of tramadol HCl in 75 mothers