1. Clinical Overview
Cefoperazone + Sulbactam is a fixed-dose combination injectable antibiotic. Cefoperazone is a third-generation cephalosporin with a broad spectrum of activity against Gram-positive and Gram-negative bacteria, including Pseudomonas aeruginosa. Sulbactam is a β-lactamase inhibitor that irreversibly inhibits a wide range of β-lactamase enzymes (including Richmond-Sykes Class II to V), thereby protecting cefoperazone from enzymatic degradation and restoring its activity against many resistant strains. This combination is particularly valuable in the Indian context for treating hospital-acquired infections where β-lactamase-producing organisms are prevalent.
| Onset | Duration | Bioavailability |
|---|---|---|
| Rapid; therapeutic serum concentrations are achieved within 30-60 minutes of intravenous infusion. | Approximately 6-8 hours, supporting a typical dosing interval of every 12 hours. | 100% for intravenous administration; Intramuscular bioavailability is approximately 70-80%. |
2. Mechanism of Action
Cefoperazone binds to penicillin-binding proteins (PBPs) on the bacterial cell wall, inhibiting the final transpeptidation step of peptidoglycan synthesis, leading to cell lysis and death. Sulbactam has weak intrinsic antibacterial activity but acts as a 'suicide' inhibitor. It binds irreversibly to a wide spectrum of beta-lactamase enzymes (including plasmid-mediated TEM-1 and chromosomal-mediated enzymes from Gram-negative bacteria), preventing them from hydrolyzing and inactivating cefoperazone.
3. Indications & Uses
- Severe Intra-abdominal Infections (peritonitis, cholangitis, cholecystitis)
- Complicated Urinary Tract Infections (including pyelonephritis)
- Skin and Soft Tissue Infections (diabetic foot, surgical site infections)
- Pelvic Inflammatory Disease (PID) and other gynecological infections
- Hospital-Acquired Pneumonia (including ventilator-associated pneumonia)
- Septicemia
- Bone and Joint Infections (osteomyelitis, septic arthritis)
4. Dosage & Administration
Adult Dosage: 1.5 g (Cefoperazone 1g + Sulbactam 0.5g) IV every 12 hours. For severe/life-threatening infections (e.g., nosocomial pneumonia, septicemia): 3 g (2g + 1g) IV every 12 hours or 1.5 g every 8 hours. Maximum daily dose: Sulbactam should not exceed 4g/day.
Administration: For IV use: Reconstitute with Sterile Water for Injection. Further dilute in 50-100 mL of compatible IV fluid (0.9% NaCl, 5% Dextrose, RL). Infuse over 15-30 minutes. For IM use: Reconstitute with Sterile Water for Injection or 1% Lidocaine HCl (without epinephrine) to reduce pain. Administer deep IM into a large muscle mass. Do not mix with aminoglycosides in the same syringe or infusion bag.
5. Side Effects
Common side effects may include:
- Diarrhea or loose stools
- Pain/induration at injection site (IM route)
- Thrombophlebitis (IV route)
- Transient elevation of liver enzymes (ALT/AST/ALP)
- Rash, pruritus
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Alcohol (Ethanol) & Alcohol-containing preparations | Disulfiram-like reaction: flushing, sweating, headache, tachycardia, nausea, vomiting. | Major |
| Oral Anticoagulants (Warfarin, Acenocoumarol) and Heparin | Increased risk of bleeding due to hypoprothrombinemia and possible platelet dysfunction. | Major |
| Aminoglycosides (Gentamicin, Amikacin) | Synergistic antibacterial effect against some organisms, but physical incompatibility if mixed in same IV line/syringe. Increased risk of nephrotoxicity. | Moderate |
| Probenecid | Does not significantly affect renal excretion of cefoperazone but may increase sulbactam levels. | Minor |
| Furosemide and other potent diuretics | Potential increased risk of nephrotoxicity. | Moderate |
| Live Bacterial Vaccines (Typhoid, Cholera) | Antibiotics may diminish the therapeutic effect of these vaccines. | Moderate |
7. Patient Counselling
- Do complete the full course of treatment as prescribed, even if you feel better.
- Do inform all your doctors about this medication before any surgery.
- Do report any severe diarrhea, abdominal cramps, or blood/mucus in stool immediately.
- Do inform your doctor if you are taking blood thinners (like warfarin).
- DO NOT consume any alcohol (beer, wine, spirits) or products containing alcohol (cough syrups, tonics) during and for at least 3 days after stopping the injection.
8. Toxicology & Storage
Overdose: Neurological reactions including seizures, encephalopathy (especially in renal failure). Severe nausea, vomiting, diarrhea. Potential for severe bleeding due to coagulopathy.
Storage: Store unopened vials at controlled room temperature (15-25°C), protected from light and moisture. After reconstitution: Stability varies with diluent. When reconstituted with Sterile Water for Injection (for IM/IV), use immediately. If diluted in IV bags (NS/D5W), solution is stable for 24 hours at room temperature or 7 days if refrigerated (2-8°C). Do not freeze. Discard any unused portion.