Amoxicillin (α-amino-p-hydroxybenzyl penicillin) is a semisynthetic derivative of penicillin with a structure similar to ampicillin but with better absorption when taken by mouth, thus yielding higher concentrations in blood and in urine.
Amoxicillin is a medication derived from penicillin with improved oral absorption compared to other penicillins like ampicillin. This leads to higher blood and urine levels of the drug.