Cephalexinum

Cefalexin (INN); Cephalexin (USAN); 7-(D-α-aminophenylacetamido)-3-methyl-3-cephem-4-carboxylic acid. Formula C16H17N3O4S, molar mass 347.39 g/mol. CAS 15686-71-2 (anhydrous); 23325-78-2 (monohydrate). PubChem CID 27447 (anhydrous), CID 62921 (monohydrate). · Cephalexin, Cefalexin, Keflex, Cephalexinum (homeopathic). Brand names include Keflex, Ceporex, Cefanex.

Modern MM

Sphere of action is defined by toxicology, not by a proving: principally the gastro-intestinal mucosa (antibiotic-associated diarrhea/colitis) and the skin (drug eruptions, urticaria, hypersensitivity), with secondary action on the genito-urinary mucosa (candidiasis, pruritus) and kidney/liver. There is no verified mental or constitutional picture.

Key symptoms

No proving-based keynotes exist for Cephalexinum; it is absent from the classical materia medicas (Allen, Clarke, Boericke). Any indications are inferential, derived from the documented toxicology of cephalexin under the Law of Similars: antibiotic-associated diarrhea and colitis (including C. difficile / pseudomembranous colitis arising during or after antibiotic courses); drug eruptions — itching rash, urticaria, angioedema, eosinophilic skin reactions; and post-antibiotic candidal overgrowth with genital/vaginal pruritus. These are pharmacological-action indications, NOT verified keynotes.

Worse (aggravation)

No proving-derived modalities exist. None can be reliably stated.

Better (amelioration)

No proving-derived modalities exist. None can be reliably stated.

Manohar V Nagaiah

Materia Medica of Modern Homeopathic Medicine · 2026

Cephalexin, Cefalexin, Keflex, Cephalexinum (homeopathic). Brand names include Keflex, Ceporex, Cefanex.

Source & Nature

Cephalexinum is the homeopathic preparation of cefalexin (cephalexin), a first-generation oral cephalosporin β-lactam antibiotic (C16H17N3O4S; molar mass 347.39 g/mol; CAS 15686-71-2; PubChem CID 27447). Developed in 1967 and marketed from 1969 as Keflex, it acts conventionally by inhibiting bacterial cell-wall (peptidoglycan) synthesis through binding to penicillin-binding proteins. It is one of the most prescribed antibiotics worldwide.

Preparation

Made by trituration of the drug substance with lactose at low potencies, then serial dilution and succussion in alcohol/water for higher potencies, per homeopathic pharmacopoeial method. Marketed by homeopathic pharmacies as pellets (sucrose base, lactose-free), oral drops (23% alcohol) and medicating potency (90% alcohol). Commonly stocked in 12C, 15C and 30C.

Continue Modern MM in the app

Classical texts are in the public domain. Educational reference only — not medical advice.