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