1. Clinical Overview
Cefditoren is a third-generation, broad-spectrum, oral cephalosporin antibiotic. It is a prodrug that is hydrolyzed to its active form, cefditoren pivoxil, in the intestinal wall. It is bactericidal and exhibits enhanced stability against many beta-lactamases. In the Indian context, it is a valuable option for community-acquired respiratory and skin infections, particularly where resistance to older antibiotics like amoxicillin is suspected.
| Onset | Duration | Bioavailability |
|---|---|---|
| Peak plasma concentrations are reached in approximately 1.5 to 3 hours post-dose. | Approximately 12 hours, supporting a twice-daily (BD) dosing regimen. | Approximately 14-16% under fasting conditions. Bioavailability increases significantly (up to 50-70%) when taken with a high-fat meal. |
2. Mechanism of Action
Cefditoren is bactericidal. It binds to and inhibits penicillin-binding proteins (PBPs), primarily PBP-2 and PBP-3, located on the inner membrane of the bacterial cell wall. This inhibition disrupts the final transpeptidation step of peptidoglycan synthesis, leading to the formation of a defective cell wall and ultimately osmotic lysis and cell death.
3. Indications & Uses
- Acute Bacterial Exacerbation of Chronic Bronchitis (AECB) caused by Haemophilus influenzae, Haemophilus parainfluenzae, Streptococcus pneumoniae, or Moraxella catarrhalis.
- Community-Acquired Pneumonia (CAP) of mild to moderate severity caused by S. pneumoniae, H. influenzae, or M. catarrhalis.
- Acute Pharyngitis/Tonsillitis caused by Streptococcus pyogenes (Group A Streptococcus).
- Uncomplicated Skin and Skin Structure Infections (uSSSIs) caused by Staphylococcus aureus (methicillin-susceptible) or Streptococcus pyogenes.
4. Dosage & Administration
Adult Dosage: 200 mg orally twice daily (every 12 hours) with meals. Duration: 5-14 days depending on infection.
Administration: MUST be taken with a meal (preferably containing fats) to ensure adequate absorption. Tablet should be swallowed whole with a glass of water. Do not crush or chew.
5. Side Effects
Common side effects may include:
- Diarrhea (may be mild to moderate)
- Nausea
- Headache
- Abdominal pain
- Vaginal moniliasis (candidiasis)
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Probenecid | Inhibits renal tubular secretion of cefditoren, increasing its plasma concentration and half-life. | Moderate |
| Antacids (Aluminum/Magnesium hydroxide) or H2 Blockers (Famotidine) | Reduce gastric acidity, which may decrease the absorption and bioavailability of cefditoren. | Moderate |
| Iron Supplements / Multivitamins with Minerals | Cationic minerals (Fe2+, Zn2+, Ca2+) can chelate cefditoren in the GI tract, significantly reducing its absorption. Administer at least 2-3 hours apart. | Major |
| Warfarin | Cephalosporins may potentiate anticoagulant effect by altering gut flora and reducing vitamin K synthesis. Monitor INR closely. | Moderate |
| Other Nephrotoxic drugs (Aminoglycosides, Loop Diuretics) | Increased risk of nephrotoxicity. | Moderate |
7. Patient Counselling
- DO take this medicine exactly as prescribed, for the full course, even if you feel better.
- DO take each dose with a meal or snack containing fats (e.g., milk, curd, chapati with ghee).
- DO NOT take antacids, iron, calcium, or zinc supplements within 2-3 hours of taking this medicine.
- DO inform your doctor if you have had kidney problems or severe allergic reactions to any antibiotic.
- DO NOT share your medication with others.
8. Toxicology & Storage
Overdose: Nausea, vomiting, epigastric distress, diarrhea. In cases of significant overdose, especially in renal impairment, neurological symptoms such as seizures may occur.
Storage: Store below 30°C. Protect from light and moisture. Keep the container tightly closed. Keep out of reach of children.