Meropenem B. Braun (Meropenem)

Meropenem is a broad‑spectrum carbapenem used for serious infections caused by susceptible bacteria.

• Complicated intra‑abdominal infections: provides bactericidal activity against mixed aerobic and anaerobic pathogens.
• Hospital‑acquired pneumonia, including ventilator‑associated pneumonia: targets resistant Gram‑negative and Gram‑positive organisms.
• Complicated urinary tract infections: eradicates Enterobacteriaceae and Pseudomonas species.
• Bacterial meningitis: penetrates the cerebrospinal fluid to treat meningitic pathogens.
• Sepsis and septic shock: offers rapid bacterial clearance in critically ill patients.

• Meropenem inhibits bacterial cell wall synthesis by binding with high affinity to penicillin‑binding proteins. This binding disrupts the final transpeptidation step of peptidoglycan cross‑linking, leading to loss of cell wall integrity and bacterial cell death. The drug exhibits a broad spectrum of activity against Gram‑positive, Gram‑negative, and anaerobic organisms, including many resistant strains.

Adverse reactions may occur with meropenem therapy and are categorized by frequency and severity.

Common Side Effects

• Nausea: mild to moderate gastrointestinal upset.
• Diarrhea: may be watery and self‑limiting.
• Headache: transient and usually resolves without intervention.
• Injection site pain: discomfort at the intravenous site.
• Elevated liver enzymes: mild, reversible changes in hepatic function.

Serious or Rare Side Effects

• Seizures: especially in patients with renal impairment or CNS disorders.
• Severe allergic reactions: including anaphylaxis and rash.
• Clostridioides difficile colitis: may cause severe diarrhea.
• Thrombocytopenia: reduced platelet count requiring monitoring.
• Acute kidney injury: potential renal function decline.

When using meropenem, clinicians should consider several safety measures.

• Renal function: adjust dose in patients with impaired kidney function.
• CNS disorders: monitor for neurotoxicity, especially seizures.
• Allergy history: avoid in patients with known carbapenem hypersensitivity.
• Pregnancy and lactation: use only if clearly needed, as safety data are limited.
• Concomitant antibiotics: assess for additive toxicity.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze.

Meropenem may interact with other medicines, affecting efficacy or safety.

Major Interactions (Avoid)

• Valproic acid: risk of decreased plasma levels and loss of seizure control.
• Probenecid: may increase meropenem concentrations, raising toxicity risk.

Moderate Interactions (Monitor Closely)

• Aminoglycosides: additive nephrotoxicity; monitor renal function.
• Loop diuretics: potential for electrolyte disturbances; observe serum levels.
• Warfarin: possible alteration of INR; check coagulation parameters regularly.