Eric Walker added a number of topics and a number of links to Penicillin antibiotics, and added Penicillin antibiotics to Narrow-spectrum antibiotics and Beta-lactam antibiotics

Eric Walker added Piperacillin-tazobactam and Evaluating the Role of New Beta-Lactam Agents for Uncommon Pathogens to Piperacillin, and added Piperacillin to Ureidopenicillins

Eric Walker added Piperacillin to Ureidopenicillins, and added Ureidopenicillins to Penicillin antibiotics