WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 317456

CAS#: 15686-71-2

Description: Cephalexin is a cephalosporin antibiotic used to study the effect of expression, binding, and inhibition of PBP3 and other penicillin-binding proteins on bacterial cell wall mucopeptide synthesis. Cephalexin disrupts the synthesis of the peptidoglycan layer of bacterial cell walls which is responsible for cell wall structural integrity. Peptidoglycan synthesis is facilitated by transpeptidases known as penicillin-binding proteins.

Chemical Structure

CAS# 15686-71-2

Theoretical Analysis

MedKoo Cat#: 317456
Name: Cephalexin
CAS#: 15686-71-2
Chemical Formula: C16H17N3O4S
Exact Mass:
Molecular Weight: 347.89
Elemental Analysis: C, 55.32; H, 4.93; N, 12.10; O, 18.42; S, 9.23

Price and Availability

Size Price Availability Quantity
500.0mg USD 70.0 2 Weeks
1.0g USD 90.0 2 Weeks
2.0g USD 150.0 2 Weeks
5.0g USD 250.0 2 Weeks
10.0g USD 350.0 2 Weeks
20.0g USD 550.0 2 Weeks
50.0g USD 850.0 2 Weeks
100.0g USD 1450.0 2 Weeks
Click to view more sizes and prices
Bulk inquiry

Synonym: Cephalexin; Cefalexin; Cephacillin; Ceporexin; Keflex; Celexin; Cephalexin Hemihydrate; Cephalexin Hydrochloride; Cephalexin Monohydrate; Cephalexin Monohydrochloride; Cephalexin Monohydrochloride, Monohydrate; Cephalexin, (6R-(6alpha,7alpha(R*)))-Isomer; Cephalexin, (6R-(6alpha,7beta(S*)))-Isomer; Cephalexin, (6R-(6alpha,7beta))-Isomer; Cephalexin, Monosodium Salt; Cephalexin, Monosodium Salt, (6R-(6alpha,7beta))-Isomer; Ceporexine; Dihydride, Cephalexin; Hemihydrate, Cephalexin; Hydrochloride, Cephalexin; Monohydrate Cephalexin Monohydrochloride; Monohydrate, Cephalexin; Monohydrochloride, Cephalexin; Monohydrochloride, Monohydrate Cephalexin; Monosodium Salt Cephalexin; Palitrex

IUPAC/Chemical Name: (6R,7R)-7-[[(2R)-2-amino-2-phenylacetyl]amino]-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid


InChi Code: InChI=1S/C16H17N3O4S/c1-8-7-24-15-11(14(21)19(15)12(8)16(22)23)18-13(20)10(17)9-5-3-2-4-6-9/h2-6,10-11,15H,7,17H2,1H3,(H,18,20)(H,22,23)

SMILES Code: CC1=C(N2C(C(C2=O)NC(=O)C(C3=CC=CC=C3)N)SC1)C(=O)O

Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO, not in water

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 347.89 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

Molarity Calculator

Calculate the mass, volume, or concentration required for a solution.

*When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and SDS / CoA (available online).

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Dilution Calculator

Calculate the dilution required to prepare a stock solution.

1: Pontremoli C, Barbero N, Viscardi G, Visentin S. Mucin-drugs interaction: The
case of theophylline, prednisolone and cephalexin. Bioorg Med Chem. 2015 Oct
15;23(20):6581-6. doi: 10.1016/j.bmc.2015.09.021. Epub 2015 Sep 15. PubMed PMID:

2: Beloglazova NV, Eremin SA. Design of a sensitive fluorescent polarization
immunoassay for rapid screening of milk for cephalexin. Anal Bioanal Chem. 2015
Nov;407(28):8525-32. doi: 10.1007/s00216-015-9006-6. Epub 2015 Sep 28. PubMed
PMID: 26416019.

3: Singh PK, Prabhune A, Ogale S. Pulsed Laser-Driven Molecular Self-assembly of
Cephalexin: Aggregation-Induced Fluorescence and Its Utility as a Mercury Ion
Sensor. Photochem Photobiol. 2015 Nov;91(6):1340-7. doi: 10.1111/php.12526. Epub
2015 Oct 14. PubMed PMID: 26333412.

4: Patel R, Amber KT. Thrombotic thrombocytopenic purpura in a postoperative
patient taking cephalexin responding to plasmapheresis: A case report and review
of cephalosporin-induced TTP. J Clin Apher. 2015 Aug 14. doi: 10.1002/jca.21420.
[Epub ahead of print] PubMed PMID: 26274019.

5: Baradhi KM, Ahmed S, Buford ML. The Case | Acute renal failure after
antibiotic treatment for bronchitis. Diagnosis: Pigment nephropathy from
cephalexin-induced immune hemolytic anemia. Kidney Int. 2015 Jun;87(6):1269-70.
doi: 10.1038/ki.2014.152. PubMed PMID: 26024043.

6: Anacona JR, Rangel V, Loroño M, Camus J. Tetradentate metal complexes derived
from cephalexin and 2,6-diacetylpyridine bis(hydrazone): Synthesis,
characterization and antibacterial activity. Spectrochim Acta A Mol Biomol
Spectrosc. 2015 Oct 5;149:23-9. doi: 10.1016/j.saa.2015.04.054. Epub 2015 Apr 25.
PubMed PMID: 25942081.

7: Lata K, Sharma R, Naik L, Rajput YS, Mann B. Synthesis and application of
cephalexin imprinted polymer for solid phase extraction in milk. Food Chem. 2015
Oct 1;184:176-82. doi: 10.1016/j.foodchem.2015.03.101. Epub 2015 Mar 28. PubMed
PMID: 25872441.

8: Anacona JR, Rincones M. Tridentate hydrazone metal complexes derived from
cephalexin and 2-hydrazinopyridine: synthesis, characterization and antibacterial
activity. Spectrochim Acta A Mol Biomol Spectrosc. 2015 Apr 15;141:169-75. doi:
10.1016/j.saa.2015.01.009. Epub 2015 Jan 31. PubMed PMID: 25677531.

9: Prados AP, Schaiquevich P, Kreil V, Monfrinotti A, Quaine P, Tarragona L,
Hallu R, Rebuelto M. A population pharmacokinetic approach to describe cephalexin
disposition in adult and aged dogs. Vet Med Int. 2014;2014:789353. doi:
10.1155/2014/789353. Epub 2014 Nov 6. PubMed PMID: 25431741; PubMed Central
PMCID: PMC4241252.

10: Agrawal A, Rao M, Jasdanwala S, Mathur A, Eng M. Cephalexin induced
cholestatic jaundice. Case Rep Gastrointest Med. 2014;2014:260743. doi:
10.1155/2014/260743. Epub 2014 Aug 7. PubMed PMID: 25180107; PubMed Central
PMCID: PMC4142286.

11: Kulapina OI, Vostrikova AM. [Rapid determination of cephalexin in biological
media]. Antibiot Khimioter. 2014;59(1-2):6-9. Russian. PubMed PMID: 25051709.

12: Ayazi P, Mahyar A, Taremiha A, Ghorani N, Esmailzadehha N. Effect of oral
cephalexin in the treatment of BCG lymphadenitis. Infez Med. 2014
Jun;22(2):112-7. PubMed PMID: 24955797.

13: Anacona JR, Rodriguez JL, Camus J. Synthesis, characterization and
antibacterial activity of a Schiff base derived from cephalexin and
sulphathiazole and its transition metal complexes. Spectrochim Acta A Mol Biomol
Spectrosc. 2014 Aug 14;129:96-102. doi: 10.1016/j.saa.2014.03.019. Epub 2014 Mar
27. PubMed PMID: 24727167.

14: Cunha BA. Cephalexin remains the preferred antibiotic for uncomplicated
cellulitis: revisited. J Chemother. 2014 Apr;26(2):65-6. doi:
10.1179/1973947814Y.0000000170. Epub 2014 Feb 18. PubMed PMID: 24548092.

15: Panda SS, Ravi Kumar BV, Dash R, Mohanta G. Determination of Cephalexin
Monohydrate in Pharmaceutical Dosage Form by Stability-Indicating RP-UFLC and UV
Spectroscopic Methods. Sci Pharm. 2013 Jul 31;81(4):1029-41. doi:
10.3797/scipharm.1306-07. eCollection 2013 Dec. PubMed PMID: 24482771; PubMed
Central PMCID: PMC3867238.

16: Bhaskara Rao BV, Mukherji R, Shitre G, Alam F, Prabhune AA, Kale SN.
Controlled release of antimicrobial Cephalexin drug from silica microparticles.
Mater Sci Eng C Mater Biol Appl. 2014 Jan 1;34:9-14. doi:
10.1016/j.msec.2013.10.002. Epub 2013 Oct 11. PubMed PMID: 24268227.

17: Chou YJ, Lee KY, Tsai MS, Sun HY, Hung CC. Use of cephalexin plus
trimethoprim/sulfamethoxazole vs cephalexin alone for treatment of uncomplicated
cellulitis. Clin Infect Dis. 2013 Oct;57(8):1216-7. doi: 10.1093/cid/cit449. Epub
2013 Jul 2. PubMed PMID: 23821731.

18: Autmizguine J, Watt KM, Théorêt Y, Kassir N, Laferrière C, Parent S, Tapiéro
B, Ovetchkine P. Pharmacokinetics and pharmacodynamics of oral cephalexin in
children with osteoarticular infections. Pediatr Infect Dis J. 2013
Dec;32(12):1340-4. doi: 10.1097/INF.0b013e3182a222a6. PubMed PMID: 23811740.

19: Liew KB, Peh KK, Loh GO, Tan YT. Three-ways crossover bioequivalence study of
cephalexin in healthy Malay volunteers. Drug Dev Ind Pharm. 2014
Sep;40(9):1156-62. doi: 10.3109/03639045.2013.798805. Epub 2013 May 20. PubMed
PMID: 23688276.

20: Yin L, Qin C, Chen K, Zhu C, Cao H, Zhou J, He W, Zhang Q. Gastro-floating
tablets of cephalexin: preparation and in vitro/in vivo evaluation. Int J Pharm.
2013 Aug 16;452(1-2):241-8. doi: 10.1016/j.ijpharm.2013.05.011. Epub 2013 May 13.
PubMed PMID: 23680730.