How to remember cephalosporins
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How to Remember Cephalosporins
The Big Picture Rule
As generation number increases:
- Gram-negative coverage increases
- Gram-positive coverage decreases
- Beta-lactamase stability increases
"Go up a generation, gain gram-negatives, lose gram-positives."
Mnemonic: Drug Name Patterns
This is the fastest way to classify any cephalosporin by name:
| Clue | Generation | Examples |
|---|---|---|
| "Cef-A-..." (A after Cef) | 1st gen | Cefazolin, Cefadroxil, Cephalexin |
| "FUR / FOX / FON / TEA / M" | 2nd gen | Cefuroxime, Cefoxitin, Cefonicid, Cefotetan, Cefmandole |
| Ends in "-me" | 3rd gen (mostly) | Cefotaxime, Ceftriaxone (near), Cefixime |
| "-pi-" in the name | 4th gen | Cefipime, Cefipirome |
| "-ro-" / "-tar-" | 5th gen | Ceftaroline, Ceftobiprole |
Exceptions to memorize: Cefaclor (has "A" but is 2nd gen), Cefepime (ends in "-me" but is 4th gen), Cefuroxime (ends in "-me" but is 2nd gen).
Generation-by-Generation Breakdown
1st Generation - "The Strep/Staph Specialists"
Mnemonic: PEcK = the gram-negatives they cover
- Proteus mirabilis
- E. coli
- Klebsiella pneumoniae
Key drugs: CefaZolin (IV - surgical prophylaxis, #1 pick), CephaLEXin (oral)
"1st gen = cefaZolin for the Zap before surgery"
Uses: Skin/soft tissue infections, surgical prophylaxis, MSSA infections
Does NOT cover: Pseudomonas, MRSA, Enterococcus, anaerobes (B. fragilis), CNS (can't cross BBB)
2nd Generation - "FOX & Friends" (adds H. flu + anaerobes)
Mnemonic: HEN PEcKS = gram-negatives now covered
- Haemophilus influenzae, Enterobacter, Neisseria + all of PEcK + Serratia (some)
Mnemonic for drug names: "FURy FOX FOR FON TEA + 2 Ms"
- CeFURoxime, CeFOXitin, CeFORanide, CeFONicid, cefoTEtan, Cefaclor, CefoMandole, CefoMetazole
The cephamycins (cefoxitin, cefotetan): special 2nd-gen drugs with anti-anaerobe (B. fragilis) coverage - used for intra-abdominal/pelvic infections
3rd Generation - "The Meningitis Generation"
Key feature: Penetrate the BBB - used for meningitis and sepsis
Mnemonic: "Taxi rides to Tria-zone"
- Cefotaxime (Taxi...) and Ceftriaxone (Tria-zone) = the "go-to" 3rd gen drugs
For Pseudomonas specifically: CeftaziDIME and CefoperaZONE (remember: "zapping Pseudo takes a dime and a zone")
Coverage: Broad gram-negatives (HEN PEcKS + Neisseria meningitidis, S. pneumoniae) but less gram-positive activity than 1st gen
Key clinical uses:
- Ceftriaxone: meningitis, gonorrhea, CAP, Lyme disease
- Ceftazidime: Pseudomonas infections
- Cefdinir/Cefpodoxime: oral, used for otitis media and sinusitis
4th Generation - "The Best of Both Worlds"
Mnemonic: "4th gen = CEFepime, the EPIK drug"
- Cefepime = the main 4th gen drug
- Extended gram-negative (including Pseudomonas) AND better gram-positive than 3rd gen
- Highly stable against beta-lactamases (AmpC)
"4th gen = 3rd gen + gram-positives back + Pseudomonas"
5th Generation - "MRSA Killers"
Mnemonic: "5th gen has 5-letter middle: -TAR- or -RO-"
- Ceftaroline = first cephalosporin active against MRSA (think: "targets MRSA")
- Ceftobiprole = also covers MRSA + Pseudomonas
"Only generation that covers MRSA - when you need the 5th gear for resistant bugs"
The Coverage Ladder (Summary Table)
| Generation | Gram+ | Gram- | Pseudomonas | Anaerobes | BBB | MRSA |
|---|---|---|---|---|---|---|
| 1st | +++ | + (PEcK) | No | No | No | No |
| 2nd | ++ | ++ (HEN PEcKS) | No | Cephamycins only | No | No |
| 3rd | + | +++ | Ceftazidime/Cefoperazone | No | Yes | No |
| 4th | ++ | +++ | Yes | No | Yes | No |
| 5th | +++ | +++ | Ceftobiprole | No | Yes | Yes |
What Cephalosporins NEVER Cover - "LAME"
- L - Listeria
- A - Atypicals (Mycoplasma, Chlamydia, Legionella)
- M - MRSA (until 5th gen)
- E - Enterococcus
Adverse Effects Mnemonic: "DDT HAPeNS"
- Diarrhea
- Disulfiram-like reaction (with alcohol - mainly MTT-containing 2nd gen cefamycins)
- Thrombophlebitis (IV)
- Hypoprothrombinemia
- Allergy/hypersensitivity (cross-reactivity with penicillin ~1-5%, mainly 1st gen)
- Pain (severe with IM)
- Nephrotoxicity (potentiated by aminoglycosides)
- Superinfections (fungal)
Clinical "Must-Know" Associations
| Scenario | Cephalosporin |
|---|---|
| Surgical prophylaxis | Cefazolin (1st gen) |
| Community meningitis (empiric) | Ceftriaxone (3rd gen) + vancomycin |
| Gonorrhea (single dose) | Ceftriaxone 500 mg IM |
| Pseudomonas infection | Ceftazidime or Cefepime |
| MRSA (cephalosporin needed) | Ceftaroline (5th gen) |
| Intra-abdominal (anaerobe coverage) | Cefoxitin or Cefotetan (2nd gen cephamycins) |
| Peds otitis media/sinusitis | Cefdinir or Cefpodoxime (3rd gen oral) |
Sources: Katzung's Basic and Clinical Pharmacology, 16th Edition; Lippincott Illustrated Reviews: Pharmacology; Epomedicine mnemonics
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