List of β-lactam antibiotics
![](../I/m/Beta-lactam_core_structures.svg.png)
The β-lactam core structures. (A) A penam. (B) A carbapenam. (C) An oxapenam. (D) A penem. (E) A carbapenem. (F) A monobactam. (G) A cephem. (H) A carbacephem. (I) An oxacephem.
This is a list of common [ight]—both administered drugs and those not in clinical use—organized by structural class. Antibiotics are listed alphabetically within their class or subclass by their nonproprietary name. If an antibiotic is a combination drug, both ingredients will be listed.
Penams
![](../I/m/Penicillin-G.png)
Penicillin G
![](../I/m/Amoxicillin-2D-skeletal.png)
Amoxicillin
Main articles: Penicillin and Penam
Narrow-spectrum
β-Lactamase-sensitive
- Benzathine penicillin (benzathine & benzylpenicillin)
- Benzylpenicillin (penicillin G)
- Phenoxymethylpenicillin (penicillin V)
- Procaine penicillin (procaine & benzylpenicillin)
β-Lactamase-resistant
Broad spectrum
Extended-spectrum
Main article: Extended-spectrum_penicillin
Carboxypenicillins
Ureidopenicillins
Cephems
![](../I/m/Cephalosporin_C.svg.png)
Cephalosporin C
![](../I/m/Cefoxitin.svg.png)
Cefoxitin
First Generation (Moderate spectrum)
Second generation (Moderate spectrum)
With anti-Haemophilus activity
With anti-anaerobic activity
Third generation (Broad spectrum)
Fourth generation (Broad spectrum)
(With β-lactamase stability and enhanced activity against Gram-positive bacteria and Pseudomonas aeruginosa)
Fifth generation* (Broad spectrum)
(Antipseudomonal in addition to activity against MRSA and VRE. *Not universally accepted nomenclature. )
Carbapenems and penems
(Broadest spectrum of β-lactam antibiotics)
![](../I/m/Thienamycin.png)
Thienamycin
Main articles: Carbapenem and Penem
Monobactams
![](../I/m/Aztreonam_structure.svg.png)
Aztreonam
Main article: Monobactam
- Aztreonam
- Tigemonam
- Nocardicin A
- Tabtoxinine β-lactam (does not inhibit penicillin-binding proteins)
β-Lactamase inhibitors
![](../I/m/Clavulanic_acid.svg.png)
Clavulanic Acid
Main article: β-Lactamase inhibitor
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