Tramadol and its metabolite, O-desmethyltramadol (M1), are existing in human milk. There is no info on the results on the drug to the breastfed toddler or the results with the drug on milk generation. The M1 metabolite is more strong than tramadol in mu opioid receptor binding [see Scientific Pharmacology https://australiane319fls4.wikipublicist.com/user