Cefixime 400 mg single dose?

Cefixime 400 mg – a quick snapshot

| Topic | Key points |
|-------|------------|
| What it is | Cefixime is a second‑generation oral cephalosporin antibiotic that fights bacteria by blocking their cell‑wall synthesis. |
| Typical dosing | • Standard regimen: 400 mg once daily for 7–10 days (or 200 mg twice daily in some protocols).
• Single‑dose use: 400 mg once (or 600 mg in some cases) is often given as pre‑operative or post‑operative prophylaxis in dental or minor surgical procedures, or as a single‑dose treatment for mild urinary tract infections (UTIs). |
| When it’s used | • Acute uncomplicated cystitis (UTI)
• Acute sinusitis or bronchitis
• Otitis media
• Dental infections
• Pre‑operative prophylaxis in some surgeries
• Sometimes for gonorrhea (though other agents are preferred) |
| How it works | Inhibits bacterial transpeptidase, preventing cross‑linking of peptidoglycan in the bacterial cell wall → cell lysis. |
| Common side effects | • Diarrhea (most common)
• Nausea, vomiting, stomach pain
• Headache
• Rash, itching
• Rare: severe allergic reactions, Clostridioides difficile colitis |
| Serious but rare | • Hypersensitivity (anaphylaxis)
• Severe skin reactions (Stevens‑Johnson syndrome)
• Antibiotic‑associated colitis (C. difficile) |
| Contraindications | • Known hypersensitivity to cephalosporins or penicillins (cross‑reactivity risk)
• Severe renal impairment (dose adjustment needed) |
| Drug interactions | • Methotrexate – can increase methotrexate levels → toxicity.
• Digoxin – possible increased digoxin levels.
• Antacids (magnesium or aluminum) – can reduce absorption; take at least 2 hrs before/after.
• Warfarin – may potentiate bleeding risk. |
| Key safety notes | • Take with food to improve tolerability, unless contraindicated.
• Hydrate: sip water to help kidney clearance.
• Complete the full course (unless a single‑dose regimen is specifically prescribed).
• Watch for signs of C. difficile colitis (watery diarrhea >3 days, abdominal pain, fever). |
| When not to take | • If you have a severe penicillin allergy, discuss alternatives with your clinician.
• If you have significant kidney dysfunction unless dose is adjusted.
• If you’re pregnant or breastfeeding unless benefits outweigh risks—always consult a healthcare professional. |
| Antimicrobial stewardship | • Use antibiotics only when bacterial infection is confirmed or strongly suspected.
• Avoid unnecessary “single‑dose” prescriptions that don’t match an evidence‑based protocol.
• Report any unusual symptoms promptly. |

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Bottom‑line answer

- 400 mg once daily for 7–10 days is the usual regimen for most infections.
- A single 400 mg dose is reserved for specific indications (e.g., dental prophylaxis, very mild UTIs, or short‑course treatment when the infection is likely to be fully eradicated).
- Always follow your prescriber’s instructions and finish the entire course unless told otherwise.
- If you’re unsure whether a single‑dose or longer therapy is right for you, or if you’re experiencing side effects, check in with your healthcare provider or pharmacist.

Disclaimer: This information is for educational purposes only and is not a substitute for personalized medical advice. If you have questions or concerns about cefixime, consult a licensed clinician.