Meropenem Qilu (Meropenem)

Meropenem is a broad‑spectrum carbapenem antibiotic used for severe infections caused by Gram‑negative and Gram‑positive bacteria.

• Complicated intra‑abdominal infections: provides bacterial eradication in severe peritoneal infections.
• Complicated urinary tract infections: treats resistant uropathogens in acute pyelonephritis and cystitis.
• Nosocomial pneumonia: effective against hospital‑acquired respiratory infections, including ventilator‑associated pneumonia.
• Septicemia: rapidly clears bloodstream infections caused by susceptible organisms.
• Skin and soft tissue infections: manages deep or necrotizing infections caused by resistant bacteria.

• Meropenem inhibits bacterial cell wall synthesis by binding with high affinity to penicillin‑binding proteins (PBPs). This binding disrupts the final transpeptidation step of peptidoglycan cross‑linking, leading to weakened cell walls, osmotic instability, cell lysis and bacterial death. Its broad spectrum derives from resistance to most β‑lactamases, allowing activity against many Gram‑negative, Gram‑positive and anaerobic organisms.

Meropenem may cause adverse reactions that vary in frequency and severity.

Common Side Effects

• Diarrhea: mild to moderate loose stools.
• Nausea: occasional feeling of queasiness.
• Vomiting: occasional emesis.
• Headache: transient mild headache.
• Rash: mild skin erythema or pruritus.
• Elevated liver enzymes: transient increase in transaminases.

Serious or Rare Side Effects

• Anaphylaxis: severe allergic reaction with respiratory distress.
• Seizures: especially in patients with renal impairment or CNS disease.
• Clostridioides difficile colitis: severe intestinal inflammation.
• Neutropenia: marked reduction in white blood cells.
• Hepatotoxicity: significant liver injury.
• Renal toxicity: acute kidney injury in susceptible individuals.

When using Meropenem, clinicians should consider patient‑specific factors and monitor for adverse events.

• Renal function: adjust dose in patients with impaired clearance.
• CNS disorders: monitor for seizures, especially in those with pre‑existing epilepsy.
• Pregnancy: category B, use only if benefit outweighs risk.
• Lactation: caution, as drug is excreted in breast milk.
• Allergies: avoid in patients with known carbapenem or β‑lactam hypersensitivity.
• Storage: Store at 2-8°C: keep refrigerated, protect from light, do not freeze.

Meropenem can interact with other medicines, altering efficacy or safety.

Major Interactions (Avoid)

• Valproic acid: increased risk of seizures due to reduced plasma levels.
• Probenecid: may decrease renal clearance, raising drug concentrations.

Moderate Interactions (Monitor Closely)

• Aminoglycosides: additive nephrotoxicity; monitor renal function.
• Loop diuretics: potential for electrolyte disturbances; watch serum levels.
• Anticoagulants (e.g., warfarin): possible alteration of INR; check coagulation parameters.
• Oral contraceptives: may reduce effectiveness; advise alternative contraception.