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Systematic (IUPAC) name
azabicyclo[4.2.0]oct-4-ene-5-carboxylic acid
Clinical data
Trade names Cefzon, Omnicef
AHFS/Drugs.com Monograph
MedlinePlus a698001
  • US: B (No risk in non-human studies)
Routes of
Legal status
Legal status
Pharmacokinetic data
Bioavailability 16% to 21% (dose-dependent)
Protein binding 60% to 70%
Metabolism Negligible
Biological half-life 1.7 ± 0.6 hours
Excretion Renal
CAS Number 91832-40-5 YesY
ATC code J01DD15 (WHO)
PubChem CID 6915944
DrugBank DB00535 YesY
ChemSpider 5291705 YesY
KEGG D00917 YesY
Chemical data
Formula C14H13N5O5S2
Molar mass 395.416 g/mol

Cefdinir is a third-generation oral cephalosporin antibiotic sold under the brand names Cefzon and Omnicef.

As of 2008, cefdinir, as Omnicef, was the highest-selling cephalosporin antibiotic in the United States, with more than US$585 million in retail sales of its generic versions alone.[1] Cephalosporin is structurally similar to cefixime.

It was discovered by Fujisawa Pharmaceutical Co., Ltd. (now Astellas) and introduced in 1991 under the brand name Cefzon.[2][3] Warner-Lambert licensed this cephalosporin for marketing in US from Fujisawa.[4] Abbott obtained U.S. marketing rights to Omnicef (cefdinir) in December 1998 through an agreement with Warner-Lambert Company.[5] It was approved by FDA on Dec 4, 1997.[6] It is available in US as Omnicef by Abbott Laboratories and in India as Cednir by Abbott, Kefnir by Glenmark, Cefdair by Xalra Pharma and Cefdiel by Ranbaxy.

Mechanism of action[edit]

Main article: Cephalosporin


Therapeutic uses of cefdinir include otitis media, soft tissue infections, and respiratory tract infections, including sinusitis, strep throat (note: no documented resistance of Group A Streptococcus to penicillin has ever been reported, and penicillin or amoxicillin is preferred except in penicillin allergic patients), community-acquired pneumonia, and acute exacerbations of bronchitis.

Susceptible organisms[edit]

Cefdinir is a bacteriocidal antibiotic of the cephalosporin class of antibiotics. It can be used to treat infections caused by several Gram-negative and Gram-positive bacteria.

Spectrum of bacterial susceptibility and resistance[edit]

Cefdinir is a broad-spectrum antibiotic and has been used to treat infections of the respiratory tract including pneumonia, sinusitis, and bronchitis. The following represents MIC susceptibility data for a few medically significant microorganisms.[7]

  • Haemophilus influenzae: 0.05 - 4 μg/ml
  • Streptococcus pneumoniae: 0.006 - 64 μg/ml
  • Streptococcus pyogenes: ≤0.004 - 2 μg/ml

Side effects[edit]

Side effects include diarrhea, vaginal infections or inflammation, nausea, headache, and abdominal pain."[8]

Available forms[edit]

Cefdinir is administered orally. It is available as capsules and a suspension. Dosage, schedule, and duration of therapy varies according to the type of infection.

"Blood" in the stool[edit]

The pediatric version of cefdinir can bind to iron in the digestive tract; in rare cases, this causes a rust or red discoloration of the stool. Blood typically appears dark brown or black in stool, and testing may confirm which is present. If the reddish stool is accompanied by abdominal pain, weight loss, diarrhea, etc., a Clostridium difficile infection caused by the antibiotic could be signified.


Cefdinir synthesis:[9][10][11] Improved prepn:[12]

Acylation of the primary amine 1 with 4-bromo-3-oxobutanoyl bromide (2) leads to the amide (3). The active methylene group in that product is then nitrosated with sodium nitrite; the initial product spontaneously tautomerizes to afford the oxime (4). The bromoketone array in that intermediate constitutes a classical starting function for construction of thiazoles. Reaction of 4 with thiourea thus leads to formation of an aminothiazole moiety. Thus there is obtained the antibiotic cefdinir (5).


  1. ^ "2008 Top 200 generic drugs by retail dollars"  PDF (399.4 KB). Drug Topics (May 26, 2009). Retrieved on July 24, 2009.
  2. ^ "2005 News Releases - Astellas Pharma Inc.". astellas.com. 
  3. ^ Cabri, Walter; Ghetti, Paolo; Pozzi, Giovanni; Alpegiani, Marco (2007). "Polymorphisms and Patent, Market, and Legal Battles: Cefdinir Case Study". Organic Process Research & Development. 11: 64. doi:10.1021/op0601060. 
  4. ^ "Document". elsevierbi.com. 
  5. ^ "Medicis.com - Medicis Pharmaceutical Corporation". globenewswire.com. 
  6. ^ "Cefdinir medical facts from Drugs.com". drugs.com. 
  7. ^ "Susceptibility and Minimum Inhibitory Concentration (MIC) Data" (PDF). October 14, 2015. Retrieved October 2015.  Check date values in: |access-date= (help)
  8. ^ "Omnicef capsules Patient Information" (PDF). Abbott Laboratories. February 2004. Archived from the original (PDF) on 2006-11-18. Retrieved 2006-11-24. 
  9. ^ T. Takaya et al., BE 897864 ; eidem, U.S. Patent 4,559,334 (1984, 1985 both to Fujisawa Pharmaceuticals).
  10. ^ Inamoto, Y; Chiba, T; Kamimura, T; Takaya, T (1988). "FK 482, a new orally active cephalosporin synthesis and biological properties". The Journal of antibiotics. 41 (6): 828–30. doi:10.7164/antibiotics.41.828. PMID 3255303. 
  11. ^ Kamachi, H; Narita, Y; Okita, T; Abe, Y; Iimura, S; Tomatsu, K; Yamasaki, T; Okumura, J; Naito, T; Oki, T (1988). "Synthesis and biological activity of a new cephalosporin, BMY-28232 and its prodrug-type esters for oral use". The Journal of antibiotics. 41 (11): 1602–16. doi:10.7164/antibiotics.41.1602. PMID 3198494. 
  12. ^ González, M; Rodríguez, Z; Tolón, B; Rodríguez, J. C.; Velez, H; Valdés, B; López, M. A.; Fini, A (2003). "An alternative procedure for preparation of cefdinir". Il Farmaco. 58 (6): 409–18. doi:10.1016/S0014-827X(03)00063-6. PMID 12767379. 

External links[edit]