Ticarcillin-Clavulanate is a fixed-dose, injectable combination of an extended-spectrum penicillin (Ticarcillin) and a beta-lactamase inhibitor (Clavulanic Acid). Ticarcillin is a carboxypenicillin with activity against Gram-negative bacteria, including Pseudomonas aeruginosa. Clavulanic acid irreversibly inhibits many beta-lactamase enzymes, thereby protecting Ticarcillin from degradation and extending its spectrum to include beta-lactamase-producing strains of Staphylococcus aureus, Haemophilus influenzae, Bacteroides species, and some Enterobacteriaceae. This combination is particularly valuable in the Indian context for treating severe, polymicrobial, and hospital-acquired infections where resistance is a concern.
Adult: Standard Dose: 3.1 g (Ticarcillin 3000mg + Clavulanic Acid 100mg) IV every 4 to 6 hours. For serious systemic infections (e.g., Pseudomonas), every 4 hours is typical. Maximum daily dose is usually 18-24 g of Ticarcillin component.
Note: For IV infusion ONLY. Reconstitute each vial with Sterile Water for Injection or compatible IV solution (e.g., 0.9% NaCl). Shake well. Further dilute in a minimum of 50-100 mL of compatible diluent (0.9% NaCl, D5W, Lactated Ringer's). Infuse over 30-40 minutes. Do not mix with aminoglycosides in the same IV line/bag due to physical incompatibility; administer separately.
Ticarcillin binds to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, inhibiting the final transpeptidation step of peptidoglycan synthesis in the bacterial cell wall. This leads to the activation of autolytic enzymes in the cell wall, resulting in bacterial cell lysis and death (bactericidal). Clavulanic acid has weak intrinsic antibacterial activity but is a potent, irreversible inhibitor of many bacterial beta-lactamase enzymes (including those produced by Staphylococci, Haemophilus, Moraxella, and Bacteroides). It binds to and inactivates these enzymes, thereby protecting Ticarcillin from hydrolysis and extending its spectrum of activity.
Pregnancy: Pregnancy Category B. Ticarcillin crosses the placenta. Studies in animals have not shown teratogenic effects. Use during pregnancy only if clearly needed. No well-controlled studies in pregnant women.
Driving: Unlikely to affect ability to drive or use machines. However, dizziness has been reported rarely.
| Aminoglycosides (Gentamicin, Amikacin) | Synergistic antibacterial effect against Pseudomonas and other Gram-negatives. However, physical incompatibility when mixed in same IV line; Ticarcillin may also inactivate aminoglycosides in vitro if mixed. | Major |
| Probenecid | Blocks renal tubular secretion of Ticarcillin, increasing and prolonging its serum concentrations. May be used intentionally but increases risk of neurotoxicity. | Moderate |
| Methotrexate | Ticarcillin may decrease renal clearance of methotrexate, leading to increased methotrexate levels and toxicity (myelosuppression, mucositis). | Major |
| Oral Anticoagulants (Warfarin) | May potentiate anticoagulant effect, increasing risk of bleeding. Mechanism: Altered gut flora reducing vitamin K production, possible displacement from protein binding. | Major |
| Vecuronium, other neuromuscular blockers | May prolong neuromuscular blockade. | Moderate |
| Oral Contraceptives | Potential for reduced efficacy due to altered enterohepatic circulation; advise use of alternative non-hormonal contraception. | Moderate |
Same composition (Ticarcillin (3000mg) + Clavulanic Acid (1000mg)), different brands: