Cephalosporins are a class of β-lactam antibiotics originally derived from the fungus Acremonium. They are divided into generations based on their spectrum of activity. First generation cephalosporins such as cephazolin are effective against gram-positive and gram-negative bacteria. Second generation cephalosporins like cefuroxime have increased activity against Haemophilus influenzae and are used to treat respiratory tract infections. Third generation cephalosporins demonstrate better activity against gram-negative bacteria compared to prior generations and some like ceftriaxone have activity against Neisseria meningitidis making them useful for treating bacterial meningitis. Fourth generation cephalospor
2. History of Cephalosporins
•Cephalosporin compounds were first isolated
from cultures of Cephalosporium acremonium
from a sewer in Sardinia in 1948 by Italian
scientist Giuseppe Brotzu
3. •The cephalosporins (sg. /ˌsɛfəlɵˈspɔrɨn/) are a class
of β-lactam antibiotics originally derived from
the fungus Acremonium, which was previously known as
"Cephalosporium".
•First commercial Cephalosporin was Cephalothin
launched by Eli Lily in 1964
5. They are divided into 3 groups: Cephalosporin N
and C are chemically related to penicillin and
Cephalosporin P a steroid antibiotic resembles
fusidic acid.
They are classified according to the
chronological order in which they were produced.
6. Classification of Cephalosporins
First generation
•Cefazolin
•Cephalothin
•Cephapirin
•Cephalexin
•Cefadroxil
•Cephradine
Second Generation
•Cefuroxime
•Cefaclor
•Cefoxitin (cephamycin)
•Cefamandole
•Cefotetan
•Cefmetazole
•Cefprozil
•Cefpodoxime
•loracarbef
8. Good activity v
Staphs and Streps
Increased activity v Gram Negatives
Slightly less activity
against Gram Positives
Very good Gram negative coverage
Reasonable against Gram Positives
Ceftazidime has anti-pseudomonal activity
Very broad spectrum activity
including Pseudomonas
9. I. Indications
1. Effective alternative to Penicillins
2. Covers Gram Positive Cocci
3. Clinical Conditions
a. Skin and Soft Tissue Infection
b. Streptococcal Pharyngitis
c. Not indicated for Otitis Media
10. • Good activity v Streps &
Penicillin Resistant
Staphs.
• Surgical prophylaxis for
cardiac and vascular
surgery, insertion of
orthopaedic prostheses,
H&N surgery and most
gynaecological surgery.
• Treatment of Soft tissue
infections, particularly in
the outpatient setting.
(not for bite wounds as
poor activity against
anaerobes and Pasteurella)
Cephazolin
11. Cephamycins
• Eg Cefoxitin, Cefotetan
• Often grouped with 2nd generation cephalosporins
• Have anaerobic activity (in particular Bacteroides)
• Clinically useful in Surgical Prophylaxis for
Colorectal Surgery
12. Cefaclor
• Oral, good against URTIs &
UTIs
• Moderate activity in Soft
Tissue Infections
Cefuroxime
• Increased activity v H.
influenzae, M. catarrhalis
• Used for Community
Acquired Respiratory
Tract Infections, Surgical
prophylaxis for Colorectal
Surgery. Treatment of
post-operative wound
infections.
13. First Generation Cephalosporins
• Effective against gram(-) &gram (+)
• Proteus Mirabilis
• E coli
• Krebsiella pneumonia
Clinical Conditions
a. Skin and Soft Tissue Infection
b. Streptococcal Pharyngitis
c. Not indicated for Otitis Media
Example: Cephazolin
Second Generation Cephalosporins
• Effective against gram(-)
• Less Effective against gram(+)
• Haemophilus influenza
• Proteus Mirabilis
• E coli
• Krebsiella pneumonia
Clinical Conditions
1. Respiratory tract infections
2. Acute Sinusitis
3. Otitis Media
Examples:Cephamycins, Cefaclor, Cefuroxime
14. Mechanism: Spectrum of Activity
Gram Positive Cocci
Less activity than First Generation Cephalosporins
EKP Gram Negative Bacteria
ESP Gram Negative Bacteria
Better activity than First Generation Cephalosporins
Better activity than Second Generation Cephalosporins
No Pseudomonas activity
15. Fourth Generation Cephalosporin
• The fourth generation cephalosporins have activity
against gram-positive cocci and a broad array of gram-
negative bacteria, including P. aeruginosa and many of
the Enterobacteriaceae with inducible chromosomal -
lactamases.
16. • Cefipime
• Broad spectrum including Pseudomonas / Anti-Pseudomonal
(including ceftazidime resistant isolates)
• Enhanced activity against certain Gram negative bacilli, including
Enterobacter, Citrobacter and Serratia.
• Uses. Severe Community Acquired Pneumonia requiring Intensive
Care.
• Not effective v ESBL producing organisms.
• Good gram-positive & gram-negative coverage
• Penetrates CSF
• Limited anaerobic coverage
• Trade Name: Maxipime ®
17. • Gram Positive Cocci
• Less activity than First
Generation Cephalosporins
• EKP Gram Negative Bacteria
• ESP Gram Negative Bacteria
• Better activity than First
Generation Cephalosporins
• Better activity than Second
Generation Cephalosporins
• No Pseudomonas activity
• active against gram-
positive cocci
• gram-negative bacteria
• P. aeruginosa
Example:Cefipime
Trade Name: Maxipime
Third Generation
Cephalosporins
Fourth Generation
Cephalosporins
18. 5th Generation….
Ceftobiprole Medocaril
• Activity v MRSA & PRP.
• Has completed Phase III trials for treatment of
soft tissue infections and HAP. Licensing
probably imminent.
19. Generally distributes well into the lung; kidney; urine; synovial,
pleural, and pericardial fluids. Penetration into the cerebral spinal
fluid (CSF) of some 3rd generation cephalosporins(cefotaxime,
ceftriaxone, and ceftazidime) is adequate to effectively treat bacterial
meningitis.
Elimination is primarily via the kidneys, though a few exceptions
include cefoperazone and ceftriaxone which have significant biliary
elimination.
Metabolized in the liver
23. Cephalosporin prescribing in Renal Impairment
• Most, apart from Ceftriaxone, need dose adjustment.
• Don’t guess, consult with Pharmacist regarding correct
dosing.
• With exception of Cefipime, should not be used for
treatment of Enterobacter, Serratia, Citrobacter infections
due to induction of chromosomal Amp C beta-lactamases
in these bacteria.
• Not effective against Enterococci.
24. Drug to drug interaction:
• Cephalosporin with aminoglycosides increase the risks
of nephrotoxicity
• Cephalosporin in addition to anticoagulants experience
increase bleeding
• Alcohol while receiving cephalosporin or 72 hrs. after
receiving cause disulfiram-like reaction
26. o Assess for known allergies
o Assess for history of renal and hepatic diseases
o Performed physical assessment
o Assess the vital signs
o Assess the renal function test result including the creatinine
clearance
o Examine the injection site
Assessment:
27. • Acute pain related to GI, CNS effect of drug
• Deficient fluid volume and imbalance nutrition: less than
body requirement, related to diarrhea
• Deficient knowledge regarding drug therapy
• Risk for infection related to repeated injection
Diagnoses:
28. Implementation:
• Check culture and sensitivity reports
• Monitor renal function
• Ensure the the patienr receive the full course of cephalosporin as
prescribed
• Monitor the site of infection and presenting signs and symptoms
throught out the course of the therapy
• Provide small,frequent meals as tolerated, frequent mouth care, and
chips or sugarless candy to suck if stomatitis and sore mouth are
problems
• Ensure that the patient is hydrated
• Ensure that the patient is instructed about the appropriate dosage
regimen and possible adverse effect.
29. Evaluation:
• Patient response to the drug
• Adverse effects
• Effectiveness of the teaching plan
• Effectiveness of comfort and safety
measures and compliance with the
therapeutic regimen.