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CEPHALOSPORINS (Veterinary—Systemic)

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CEPHALOSPORINS (Veterinary—Systemic) CEPHALOSPORINS (Veterinary—Systemic) This monograph includes information on the following: Cefaclor; cephalexin, cephalothin, cephapirin, and cephradine. Cefadroxil; Cefazolin; Cefixime; Cefotaxime; Cefotetan; First-generation cephalosporins have the highest activity of the Cefoxitin; Cefpodoxime†; Ceftazidime; Ceftiofur; Cephalexin; cephalosporins against gram-positive bacteria, including most Cephalothin*; Cephapirin†; Cephradine†. Corynebacteria, Streptococci, and Staphylococci, particularly Staphylococcus aureus{R-3} and Staphylococcus intermedius.{R-32} Some commonly used brand names are: Cephalothin and cephapirin generally have the greatest activity For veterinary-labeled products— against staphylococci;{R-2} Staphylococcus epidermidis is only Cefa-Drops [Cefadroxil] Excenel RTU [Ceftiofur] variably susceptible to cephalexin and cefadroxil.{R-1} Excede [Ceftiofur] Naxcel [Ceftiofur] Rhodococcus equi, methicillin-resistant S. aureus, and Excede for Swine Simplicef [Cefpodoxime] Enterococcus species are usually resistant.{R-1} The first- [Ceftiofur] generation cephalosporins have activity against gram-negative Excenel [Ceftiofur] bacteria, including some Actinobacillus, Escherichia coli, Haemophilus influenzae, Klebsiella pneumoniae, Pasteurella, For selected human-labeled products— Proteus mirabilis, and Salmonella; however, Actinobacter, Ancef [Cefazolin] Keflin [Cephalothin] Citrobacter, Enterobacter, indole-positive Proteus, and Apo-Cefaclor [Cefaclor] Keftab [Cephalexin] Pseudomonas are resistant.{R-1; 3; 4; 53} Many anaerobic bacteria are Apo-Cephalex Kefzol [Cefazolin] susceptible to these antibacterials, with the exception of beta- [Cephalexin] lactamase–producing Bacteroides{R-1; 4} and Clostridium Ceclor [Cefaclor] Mefoxin [Cefoxitin] difficile.{R-98} Cefadyl [Cephapirin] Novo-Lexin [Cephalexin] Second-generation cephalosporins include cefaclor, cefamandole, Cefotan [Cefotetan] Nu-Cephalex cefmetazole, cefonicid, cefotetan, cefoxitin, cefprozil, and [Cephalexin] cefuroxime. Ceporacin [Cephalothin] PMS-Cephalexin Second-generation cephalosporins have the same efficacy as or [Cephalexin] perhaps slightly less efficacy than first-generation cephalosporins Ceptaz [Ceftazidime] Suprax [Cefixime] against gram-positive pathogens; however, this lack of efficacy is Claforan [Cefotaxime] Tazicef [Ceftazidime] primarily against S. aureus and S. intermedius. Second-generation Fortaz [Ceftazidime] Velosef [Cephradine] are more effective than first-generation cephalosporins in the Keflex [Cephalexin] treatment of infections caused by gram-negative bacteria such as Enterobacter, E. coli, Klebsiella, and Proteus.{R-1; 4; 7} Many Note: For a listing of dosage forms and brand names by country anaerobic bacteria are susceptible to second-generation availability, see the Dosage Forms section(s). cephalosporins; cefoxitin{R-7-9} and cefotetan{R-80} can also be effective against Bacteroides fragilis. However, Enterococcus and *Not commercially available in the U.S. Pseudomonas species are resistant to second-generation †Not commercially available in Canada. cephalosporins.{R-80} Use of these antimicrobials is generally reserved for infections that are resistant to first-generation Category: Antibacterial (systemic). cephalosporins. Third-generation cephalosporins include cefixime, cefoperazone, cefotaxime, cefpodoxime, ceftazidime, ceftizoxime, and Indications ceftriaxone. ELUS EL Note: The text between and describes uses that are not included Third-generation cephalosporins are the most effective of the ELCAN EL in U.S. product labeling. Text between and describes uses cephalosporins against antibiotic-resistant gram-negative that are not included in Canadian product labeling. bacteria.{R-1; 2; 7} Ceftazidime and cefoperazone are active against The ELUS or ELCAN designation can signify a lack of product Pseudomonas, but the majority of the third-generation availability in the country indicated. See the Dosage Forms cephalosporins commonly used in veterinary practice are not.{R-4; section of this monograph to confirm availability. 80} Third-generation cephalosporins, in general, are no more and perhaps are less effective than other cephaosporins against gram- General considerations positive bacteria.{R-1; 4; 7} Cefotaxime, ceftazidine, ceftizoxine, and Cephalosporins are wide-spectrum antibiotics used to treat a variety of ceftriaxone are the only cephalosporins that consistently reach infections in animals. They have been grouped into three effective antibacterial concentrations in the central nervous "generations" based primarily on their spectrum of antibacterial system in people with inflamed meninges. Cefpodoxime remains activity.{R-1; 2} Some of the more recently developed stable in the presence of many beta-lactamase enzymes, thereby cephalosporins may not easily fit into one of the generations, but increasing its effectiveness in the treatment of beta-lactamase– are usually included in the generation their antibacterial properties producing bacteria; however, it is not active against most obligate most closely resemble. anaerobes, Pseudomonas species, or enterococci.{R-110} First-generation cephalosporins include cefadroxil, cefazolin, Ceftiofur is a cephalosporin that does not clearly fit into the third- Evidence Quality Evidence Type A Good evidence to support a recommendation for use 1 Species-specific evidence from at least one large randomized and B Moderate evidence to support a recommendation for use controlled trial (RCT) or multiple small RCTs C Insufficient evidence to support a recommendation for use 2 Species-specific evidence from a small RCT, disease models, large D Moderate evidence to support a recommendation against use case studies, pharmacokinetic studies using surrogate endpoints, or E Good evidence to support a recommendation against use evidence from well-designed trials in a different species that is considered appropriate for comparison 3 Dramatic results from either well-designed, species-specific trials without controls or small case studies 4 Pharmacokinetic studies without surrogate endpoints 5 In vitro studies 6 Opinions of respected authorities on the basis of clinical experience or reports of expert committees © 2007 The United States Pharmacopeial Convention All rights reserved generation category and has been called a "new-generation" for injection are indicated in the treatment of urinary tract cephalosporin.{R-91} It has broader gram-positive activity, infections caused by susceptible organisms, including E. coli, P. including good activity against Streptococci, and less activity mirabilis, and S. aureus.{R-3; 11; 12} against Pseudomonas than other third-generation ELUS,CANPerioperative infections (prophylaxis)EL—Dogs: Cefazolin is cephalosporins.{R-68} It is active against beta-lactamase–producing used in the prevention of infections associated with surgery, strains as well as anaerobes, such as Fusobacterium necrophorum including bone surgery, and caused by susceptible organisms and Bacteroides melaninogenicus.{R-81} Ceftiofur is rapidly when the risk of infection is high or potentially severely metabolized to desfuroylceftiofur in vivo and S. aureus is four- to damaging.{R-1; 2; 6; 82; 83} eightfold less sensitive to desfuroylceftiofur than to the parent ceftiofur.{R-63; 100} Proteus mirabilis has a widely variable Potentially effective susceptibility to some metabolites of ceftiofur.{R-72} Infections, bacterial (treatment)— ELUS,CANBirdsEL: There are insufficient data to establish the efficacy Accepted and safety of cephalexin and cephalothin in the treatment of Escherichia coli infections (treatment)— ELCANChicksEL and turkey bacterial infections in birds, such as cranes, ducks, emu, poults, day-old: Ceftiofur for injection is indicated in the control pigeons, and quail; however, based on pharmacokinetic of early mortality associated with susceptible E. coli.{R-11; 12} studies and the apparent wide margin of safety, they have ELCANMetritis (treatment)EL—Cattle: Ceftiofur injectable suspension is been used in the treatment of susceptible bacterial indicated in the treatment of acute metritis (up to 14 days infections.{R-34} postpartum), caused by susceptible organisms.{R-81} Cats: ELUS,CANThere are insufficient data to establish the efficacy Pneumonia, bacterial (treatment)— and safety of cefotaxime{R-42} and cephalexin{R-49; 50} in the Cattle: ELCANCeftiofur injectable oil suspension,EL ceftiofur treatment of bacterial infections in cats; however, based on injectable suspension, and ceftiofur for injection are indicated pharmacokinetics, pathogen sensitivities, and the apparent in the treatment of bovine respiratory disease complex wide margin of safety, these medications are used to treat a (shipping fever), caused by susceptible organisms, including variety of susceptible infections, including certain bone, Histophilus somni (formerly Haemophilus somnus), respiratory, skin, soft tissue, and urinary tract infections.EL Mannheimia (Pasteurella) haemolytica, and Pasteurella Dogs: ELUS,CANThere are insufficient data to establish the efficacy multocida.{R-11; 12; 81; 99; 106} ELCANCeftiofur injectable oil and safety of cefaclor, cefazolin, cefotaxime, ceftiofur (for suspension is also indicated in the control of these infections non–urinary tract infections), cephalexin, cephalothin, in animals at high risk of developing them.EL{R-106} cephapirin, and cephradrine for the treatment of bacterial ELCANGoatsEL: Ceftiofur for injection is indicated in the treatment infections in dogs;
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