Amoxicillin is a?penicillin?in which the substituent at position 6 of the?penam?ring is a 2-amino-2-(4-hydroxyphenyl)acetamido group. It has a role as an antibacterial drug. Amoxicillin Anhydrous is the anhydrous form of a broad-spectrum, semisynthetic aminopenicillin antibiotic with bactericidal activity. Amoxicillin binds to and inactivates?penicillin-binding proteins (PBPs) located on the inner membrane of the bacterial cell wall. Inactivation of PBPs interferes with the cross-linkage of?peptidoglycan?chains necessary for bacterial cell wall strength and rigidity. This interrupts bacterial cell wall synthesis and results in the weakening of the bacterial cell wall and causes cell lysis.