TOPICS: Ampicillin, amoxicillin, beta lactam, gram negative bacteria, porins, penicillinase, cell wall lysis, penicillin binding protein, peptidoglycan, sulbactam, clavulanic acid, tazobactam, listeria monocytogenes, borrelia burgdorferi, strep pyogenes, maculopapular rash, ebv, infectious mononucleosis, haemophilus influenzae, hypersensitivity, h pylori, strep pneumoniae, moraxella catarrhalis, enterococcus, pseudomembranous colitis, diarrhea, vomiting