Drug lookup
Drug reference

Cefdinir

Cephalosporin · Antibiotic

Also known as OMNICEF

CephalosporinAntibiotic
CDSCO approved
EXCRETION
not curated
INTERACTIONS
none in our sources
PREGNANCY
B
FDA category + note

Mechanism

Cephalosporins, like penicillins, inhibit bacterial cell wall synthesis by targeting proteins on the inner membrane. While generally more resistant to many β-lactamases than first-generation agents, third-generation cephalosporins are susceptible to hydrolysis by inducible, chromosomally encoded (type I) β-lactamases.

Indications

EnterobacteriaceaeSerratiaNeisseria gonorrhoeaeS. aureus (activity comparable to first-generation agents)Streptococcus pneumoniae (activity comparable to first-generation agents)Streptococcus pyogenes (activity comparable to first-generation agents)Community-acquired pneumoniaMeningitisUrinary tract infectionsStreptococcal endocarditisGonorrheaSevere Lyme diseaseMany beta-lactamase producing organisms (good activity)Respiratory pathogens including gram-positive cocci (susceptible)PneumoniaAcute exacerbations of chronic bronchitisENT infectionsSkin infections

Dosing

Adult
300 mg orally every 12 hours or 600 mg orally every 24 hours
Renal adjustment
Dosage should be altered in patients with renal insufficiency as cephalosporins are primarily excreted by the kidney.
Max dose
600 mg daily

Pharmacokinetics

Half-life
1.7 hours
Bioavailability
Cap: 16–21%; Susp: 25%
Protein binding
89%
Excretion
Primarily by the kidney

Side effects

Common
Gastrointestinal side effects (e.g., diarrhea)
Serious
  • Hypersensitivity reactions (rash to anaphylaxis)
  • Serum sickness
  • Stevens-Johnson syndrome
  • Nephropathy
  • Hematologic reactions (neutropenia, prolonged use)
  • Neurotoxicity (seizure, high doses, renal impairment)

Pregnancy & lactation

Pregnancy

B

Related guidelines

Other Cephalosporin drugs

Ask House about Cefdinir

Continue into a citation-backed clinical answer with the drug context already attached.

Sources: KD Tripathi 7e, Goodman & Gilman 14e, Harrison 22e, Katzung·Verified: 2026-05-10 · House clinical team