(1) patients who are allergic to penicillin(2) While the incidence of true cross-reactivity between penicillins and cephalosporins is low, the possible reactions include anaphylaxis, which can be fatal.(3) For the patient who is allergic to penicillins , the use of trimethoprim/sulfamethoxazole is indicated.(4) The antibiotics used were mainly cephalosporins, penicillins , fluoroquinolones, aminoglycosides, tetracyclines and antituberculosis drugs.(5) Most antibiotics such as penicillins , cyclosporines, and aminoglycosides can be used safely during pregnancy, but tetracyclines should be avoided.(6) Overuse of antibiotics has been shown to drive the evolution of mutant strains of bacteria immune to a broad spectrum of drugs, including penicillins , cephalosporins, and quinolones.(7) The aminopenicillins were the first penicillins discovered to be active against gram-negative rods such as E. coli and H. influenzae.(8) Unlike Streptococcus pneumoniae, group A beta-hemolytic streptococci have not developed resistance to penicillins .(9) All the usual range of antibiotics, penicillins and cephalosporins are pretty much useless against these things.(10) Exanthematous eruptions most commonly occur in association with the administration of penicillins or cephalosporins.(11) Antibiotic categories to consider include penicillins , cephalosporins, and macrolides.(12) In general, cephalosporins and penicillins are not very effective in treating acne.(13) The lactams are a family of antimicrobial agents consisting of four major groups: penicillins , cephalosporins, monobactams, and carbapenems.(14) Oral antibiotics are usually used in the treatment and include first-generation cephalosporins, penicillinase-resistant penicillins , macrolides, and fluoroquinolones.(15) Major classes of antibiotics include tetracyclines, aminoglycosides, penicillins , cephalosporins, fluoroquinolones, streptogramins, sulfonamides, and erythromycins.(16) It is well established that far less expensive antibiotics, including the penicillins and tetracyclines, are highly effective against Anthrax.