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Syngacillin: Full Drug Profile

Medically reviewed by Min Clinic Staff | Updated: January 2026

Syngacillin - General Information

A cyclohexylamido analog of penicillanic acid. [PubChem]

 

Pharmacology of Syngacillin

Syngacillin, a penicillin, is a cyclohexylamido analog of penicillanic acid. Syngacillin is more resistant to beta-lactamase hydrolysis than ampicillin, is much better absorbed when given by mouth and, as a result, the levels reached in the blood and in the urine are considerably higher than those obtained with the same dose of ampicillin. Syngacillin has been replaced by newer penicillin treatments.

 

Additional information about Syngacillin

Syngacillin Indication

For the treatment of bacterial infections caused by susceptible organisms.

Mechanism Of Action
The bactericidal activity of cyclacillin results from the inhibition of cell wall synthesis via affinity for penicillin-binding proteins (PBPs). Syngacillin is stable in the presence of a variety of b-lactamases, including penicillinases and some cephalosporinases.
Generic Name
Cyclacillin
Synonyms
Ciclacilline [INN-French]; Ciclacillinum [INN-Latin]; Ciclacilina [INN-Spanish]; Aminocyclohexylpenicillin; Ciclacillin; Ciclacillum
Drug Category
Anti-Bacterial Agents
Drug Type
Small Molecule; Approved
Other Brand Names containing Cyclacillin
Bastcillin; Calthor; Citosarin; Cyclapen; Cyclapen-W; Orfilina; Syngacillin; Ultracillin; Vastcillin; Vipicil; Wyvital;
Absorption
Moderately absorbed.
Toxicity (Overdose)
Symptoms of overdose include severe diarrhea, nausea and vomiting.
Chemical IUPAC Name
(2S,5R,6R)-6-[(1-aminocyclohexanecarbonyl)amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
Chemical Formula
C15H23N3O4S
Organisms Affected
Enteric bacteria and other eubacteria