Cefixime 100 mg (often sold as a single‑dose tablet or in a 100‑mg/5‑mL oral suspension) is a second‑generation cephalosporin antibiotic. It’s used mainly for uncomplicated bacterial infections that are susceptible to the drug. Here’s a quick rundown to help you understand what it is, how it’s used, and what to watch out for.
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📌 What It Is & How It Works
- Class: β‑lactam antibiotic (cephalosporin)
- Mechanism: Inhibits bacterial cell‑wall synthesis → bacterial death
- Spectrum: Broad activity against many gram‑negative and some gram‑positive bacteria. Commonly effective against Escherichia coli, Streptococcus pneumoniae, Haemophilus influenzae, Neisseria gonorrhoeae (some strains), Streptococcus pyogenes, etc.
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💊 Typical Indications (U.S. FDA)
| Infection | Typical Course | Typical Dose (adult) |
|-----------|----------------|----------------------|
| Urinary Tract Infection (UTI) | 7–10 days | 200 mg once daily (two 100 mg tablets) |
| Acute Otitis Media (middle‑ear infection) | 7–10 days | 200 mg once daily |
| Acute Sinusitis | 7–10 days | 200 mg once daily |
| Pharyngitis/Streptococcal Tonsillitis | 7–10 days | 200 mg once daily |
| Gonorrhea (as part of dual therapy) | 1 dose | 400 mg single dose (often combined with azithromycin) |
Note: For many of these, a 100 mg tablet is usually taken twice a day (200 mg total), unless a higher single dose is prescribed.
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⏱️ How to Take It
| Form | Instructions |
|------|--------------|
| Tablet | Swallow whole with water. If you have difficulty swallowing, ask your pharmacist about a liquid suspension. |
| Suspension (5 mL) | Shake well, measure accurately with the provided syringe or measuring cup. Take the full dose even if you feel better. |
| Timing | Take at the same time each day (e.g., morning, night). Can be taken with or without food, but food can help reduce stomach upset. |
Finish the full course even if symptoms improve—stopping early can allow resistant bacteria to survive.
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⚠️ Important Safety & Contraindications
| Category | Key Points |
|----------|------------|
| Allergy | Avoid if you’re allergic to any cephalosporins, penicillin, or other β‑lactam antibiotics. Cross‑reactivity is rare but can occur. |
| Kidney Disease | Dose adjustment may be required. For moderate‑to‑severe renal impairment, consult your prescriber. |
| Pregnancy & Breastfeeding | Generally considered safe (Category B). Still, use under medical supervision. |
| Pediatrics | Approved for ages ≥4 years for certain infections. Dose is weight‑based (usually 5 mg/kg once daily). |
| Elderly | Monitor for renal function; may need dose adjustment. |
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⚡ Common Side Effects
- GI upset: Nausea, vomiting, diarrhea, abdominal pain.
- Allergic reactions: Rash, itching, hives; severe reactions (anaphylaxis, Stevens‑Johnson syndrome) are rare but possible.
- Superinfection: Overgrowth of Clostridioides difficile can lead to pseudomembranous colitis. Watch for persistent watery diarrhea.
- Liver enzymes: Rarely, mild increases in ALT/AST.
If you develop a rash with fever, swelling of lips/face, or breathing difficulties, seek medical attention immediately.
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🔄 Drug Interactions
| Drug | Effect | What to Do |
|------|--------|------------|
| Probenecid | ↑ cefixime levels | Monitor kidney function; dose adjustment may be needed. |
| Warfarin | ↑ INR (risk of bleeding) | Monitor INR closely; adjust warfarin dose. |
| Methotrexate | ↑ MTX levels | Monitor liver enzymes; consider dose reduction. |
| Tetracyclines | ↓ absorption | Take at least 2 hrs before or after tetracyclines. |
| Oral contraceptives | ↓ effectiveness | Use backup contraception. |
Always tell your pharmacist or prescriber about all medications (prescribed, OTC, herbal) you’re taking.
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📅 How Long Should You Take It?
- Short‑term courses (7–10 days) are typical for most infections.
- Longer courses (14–28 days) may be needed for certain complicated infections; only if prescribed by a clinician.
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📋 Quick Checklist Before Starting Cefixime
1. Confirm diagnosis – antibiotic only if bacterial infection is confirmed or highly suspected.
2. Check allergies – especially to penicillin/cephalosporins.
3. Verify renal function – especially if you have kidney disease, age >65, or are on nephrotoxic drugs.
4. Ask about drug interactions – particularly warfarin, probenecid, methotrexate, oral contraceptives.
5. Plan for full course – don't skip doses or stop early.
6. Monitor symptoms – report severe side effects or persistent GI upset.
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📚 Quick Reference
- Brand names: Zetran, Cefix, Cefex, etc. (varies by country)
- Formulations: 100 mg tablets, 200 mg tablets, 5 mL/5 mg/mL oral suspension
- Storage: Keep at room temperature; protect from moisture and direct sunlight. Once opened, the suspension usually needs to be refrigerated.
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Final Note
Cefixime 100 mg is a useful antibiotic for many common bacterial infections, but like all medicines, it needs to be used responsibly. Follow your prescriber’s instructions, complete the full course, and let them know if you experience any worrisome side effects. If you’re unsure about any aspect of your therapy, ask your healthcare provider or pharmacist—they’re there to help.
(This information is meant to be educational and is not a substitute for professional medical advice. If you have specific concerns, contact your healthcare provider.)