Meropenem Kalceks (Meropenem)

Meropenem is a carbapenem antibiotic used to treat serious bacterial infections by targeting the cell wall synthesis pathway.

• Complicated intra‑abdominal infections: effective bacterial eradication and clinical cure.
• Complicated urinary tract infections: resolves infection and prevents progression.
• Bacterial meningitis: achieves cerebrospinal fluid sterilization and reduces mortality.
• Severe sepsis and septic shock: provides broad‑spectrum coverage to control systemic infection.

• Meropenem binds with high affinity to penicillin‑binding proteins (PBPs) on bacterial cell membranes, inhibiting the final transpeptidation step of peptidoglycan synthesis. This disruption weakens the cell wall, leading to osmotic instability and bacterial lysis. Its broad spectrum includes many Gram‑negative, Gram‑positive, and anaerobic organisms, and it is resistant to most β‑lactamases.

Common Side Effects

• Nausea: mild gastrointestinal upset.
• Diarrhea: loose stools, often self‑limited.
• Rash: skin erythema or pruritus.
• Elevated liver enzymes: transient increase in ALT/AST.

Serious or Rare Side Effects

• Anaphylactic reaction: severe hypersensitivity requiring immediate medical attention.
• Seizures: especially in patients with renal impairment or CNS disorders.
• Clostridioides difficile‑associated colitis: severe diarrhea due to bacterial overgrowth.
• Severe renal impairment: acute kidney injury requiring monitoring.

Precautions should be observed when administering Meropenem.

• Renal function: adjust dose in patients with impaired renal clearance.
• Allergy history: avoid in patients with known hypersensitivity to carbapenems or other β‑lactam antibiotics.
• Pregnancy: use only if the potential benefit justifies the potential risk, as safety data are limited.
• Concomitant valproic acid: monitor for decreased valproate levels which may precipitate seizures.
• Superinfection: monitor for overgrowth of non‑susceptible organisms such as fungi or resistant bacteria.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Meropenem may interact with several medicines.

Major Interactions (Avoid)

• Valproic acid: meropenem reduces serum valproate concentrations, increasing seizure risk.
• Phenobarbital, phenytoin, carbamazepine: these enzyme inducers increase meropenem clearance, potentially reducing efficacy.
• Aminoglycosides or vancomycin: combined use may increase nephrotoxicity.

Moderate Interactions (Monitor Closely)

• Loop diuretics: may exacerbate electrolyte disturbances.
• Probenecid: can reduce renal excretion of meropenem, altering plasma levels.
• Warfarin: infection and antibiotic therapy may affect INR; monitor coagulation status.