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SHEET /m/cefalexin · PubChem CID 27447 · CAS 15686-71-2 · REV 2026.07

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Cefalexin

from source

C16H17N3O4S · 347.4 g/mol

CEX · Ceporexin · Cepastar · Cepexin

What is Cefalexin?

A first-generation cephalosporin antibiotic sold as Keflex, used for skin, bone, ear and urinary infections. from source

CategoryPrescription medicine
Chemical familyCarboxylic AcidsAminesAromaticsAmides
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Fig. 1 · 2D structure RDKit

SMILESCC1=C(N2[C@@H]([C@@H](C2=O)NC(=O)[C@@H](C3=CC=CC=C3)N)SC1)C(=O)O

Where you'll find it

Dispensed on prescription, not sold on a shelf. See the rest of the prescription medicine group.

Toxicity & hazards

DangerIrritantHealth hazardH317, H334from source

Keep roaming

Where Cefalexin leads

Relatedcomputed
Amoxicillin42% similarBoth carry a carboxylic acid, an amide and an amine group.Cefdinir36% similarBoth carry a carboxylic acid, an amide and an amine group.

Sources & methodology

PubChem CID
27447
Wikidata
Q411417
Structure
PubChem → RDKit
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