Meropenem Kalceks (Meropenem)

Meropenem is a broad‑spectrum carbapenem used for serious infections caused by Gram‑negative, Gram‑positive and anaerobic bacteria.

• Complicated intra‑abdominal infection: achieves clinical cure by eradicating mixed aerobic and anaerobic pathogens.
• Hospital‑acquired pneumonia, including ventilator‑associated pneumonia: provides rapid bacterial clearance.
• Complicated urinary tract infection: eliminates resistant Enterobacteriaceae.
• Sepsis and septic shock: offers bactericidal activity against a wide range of pathogens.
• Meningitis caused by susceptible organisms: penetrates the cerebrospinal fluid to treat infection.

• Meropenem binds to penicillin‑binding proteins (PBPs) on bacterial cell walls, inhibiting the final transpeptidation step of peptidoglycan synthesis. This disruption weakens the cell wall, leading to osmotic instability and bacterial cell death. Its high affinity for multiple PBPs and resistance to most β‑lactamases underlies its broad‑spectrum activity against Gram‑negative, Gram‑positive and anaerobic organisms.

Common Side Effects

• Nausea: mild to moderate gastrointestinal upset.
• Diarrhea: may be watery and self‑limiting.
• Rash: erythematous skin eruption.
• Infusion site phlebitis: pain or redness at IV site.
• Elevated liver enzymes: transient increase in transaminases.
• Headache: mild discomfort.

Serious or Rare Side Effects

• Seizure: risk increases with high doses or renal impairment.
• Clostridioides difficile‑associated colitis: severe diarrhea and colitis.
• Anaphylaxis: acute hypersensitivity reaction.
• Severe neutropenia: marked reduction in white blood cells.
• Renal toxicity: acute kidney injury in susceptible patients.
• Hemolytic anemia: rare immune‑mediated destruction of red cells.

Meropenem should be used with careful clinical assessment and monitoring.

• Renal function assessment: adjust dosing in patients with impaired kidney function.
• Allergy assessment: avoid in individuals with known carbapenem hypersensitivity.
• Seizure risk: monitor patients with central nervous system disorders or receiving high doses.
• Valproic acid co‑administration: avoid as meropenem reduces serum valproate levels.
• Pregnancy and lactation: use only if potential benefit justifies potential risk.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze.

Meropenem may interact with several concomitant medications.

Major Interactions (Avoid)

• Valproic acid: co‑administration can markedly decrease valproate concentrations, increasing seizure risk.
• High‑dose aminoglycosides: combined nephrotoxic potential may exacerbate renal impairment.

Moderate Interactions (Monitor Closely)

• Loop diuretics: may enhance renal clearance, requiring dose review.
• Warfarin: possible alteration of INR, necessitating coagulation monitoring.
• Other broad‑spectrum antibiotics: may increase risk of C. difficile infection.
• Antacids containing magnesium or aluminum: can reduce meropenem absorption if administered orally (rare for IV).