Antibiotic Spectrum Index
The higher the spectrum number, the broader the coverage of the antibiotic.
Use the Antibiotic Field Guide to get more information on a particular antibiotic or antibiotic class.
Drug class, prototype
Spectrum Index
Nafcillin
1
Ampicillin, amoxicillin
2
Cephalexin
2
Penicillin
2
Metronidazole
2
Erythromycin only
2
Cefazolin, cefdinir
3
Azithromycin, Clarithromycin
4
Ceftazidime
4
Clindamycin
4
TMP/Sulfa
4
Ceftriaxone
5
Gentamicin
5
Doxycycline
5
Vancomycin
6
Amoxicillin-clavulanate
6
Cefepime
6
Piperacillin-tazobactam
8
Ciprofloxacin
8
Ertapenem
9
Meropenem
10
Levofloxacin
9
Tigecycline
13
Adapted from, Gerber ICHE, 2017
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