| Term | Definition |
| penicillin | gram+ cocci, gram+ rods, gram- cocci, spirochetes |
| penicillinase-resistant penicillins | S. aureus |
| aminopenicillins | some gram+ bacteria, H. influenzae, E. coli, L. meningititdes, P. mirabilis, Salmonella, enterococci |
| antipseudomonal penicilliins | Pseudomonas and gram- rods, used with clavulanic acid |
| 1st gen cephalosporins | gram+ cocci, P. mirabilis, E. coli, Klebsiella pneumoniae |
| 2nd gen cephalosporins | gram+ cocci, H. influenzae, Enterobacter aerogenes, Neisseria, P. mirabilis, E. coli, K. pneumoniae, S. macescens |
| 3rd gen cephalosporins | serious gram- infections, meningitis |
| cefepime | gram+ organisms and Pseudomonas |
| aztreonam | gram- rods (Klebsiella, Psedomonas, Serratia) |
| carbapenems | gram+ cocci, gram- rods, anaerobes; drug of choice for Enterobacter |
| vancomycin | serious, gram+ multidrug-resistant organisms; MRSA & C. diff |
| aminoglycosides | severe gram- rod infections |
| tetracyclines | Vibrio cholerae, acne, chlamydia, ureaplasma urealyticum, mycoplasma pneumoniae, tularemia, H. pylori, Borrelia burgdorferi, rickettsia (VACUUM THe BedRoom) |
| macrolides | URIs, pneumonias, STDs; gram+ cocci, Mycoplasma, Legionella, Chlamydia, Neisseria |
| chloramphenicol | meningitis; H. influenzae, N. meningitides, S. pneumoniae |
| clindamycin | anaerobic infections (Bacteroides, C. perfringens) |
| sulfonamides | simple UTI |
| trimethoprim | used with SMX; recurrent UTIs, Shigella, Salmonella, P. jiroveci pneumonia |