Meropenem Dr. F. Eberth (Meropenem Trihydrate)

Meropenem is a broad‑spectrum carbapenem used for serious bacterial infections that require intravenous therapy.

• Complicated intra‑abdominal infections: provides rapid bactericidal activity to eradicate the causative pathogens.
• Complicated urinary tract infections: eliminates resistant Gram‑negative organisms to resolve infection.
• Nosocomial pneumonia: achieves lung tissue concentrations sufficient to treat hospital‑acquired respiratory pathogens.
• Meningitis: penetrates the cerebrospinal fluid to eradicate susceptible bacteria.
• Severe skin and soft tissue infections: offers extensive coverage against mixed aerobic and anaerobic organisms.

• Meropenem binds to penicillin‑binding proteins (PBPs) on the bacterial cell wall, inhibiting the final transpeptidation step of peptidoglycan synthesis. This disruption weakens the cell wall, leading to osmotic instability, cell lysis, and bacterial death. Its high affinity for a broad range of PBPs accounts for activity against many Gram‑positive, Gram‑negative, and anaerobic organisms.

Adverse reactions may occur with any antimicrobial therapy.

Common Side Effects

• Nausea: mild to moderate gastrointestinal upset.
• Diarrhea: may be watery and self‑limiting.
• Headache: transient and usually resolves without intervention.
• Rash: erythematous skin eruption.
• Elevated liver enzymes: transient increase in ALT/AST.
• Infusion site phlebitis: local irritation at the IV site.

Serious or Rare Side Effects

• Seizures: especially in patients with renal impairment or CNS disorders.
• Clostridioides difficile infection: severe colitis requiring medical attention.
• Anaphylaxis: acute hypersensitivity reaction with respiratory and cardiovascular compromise.
• Severe neutropenia: marked reduction in white blood cells.
• Renal toxicity: acute kidney injury in susceptible individuals.
• Hypersensitivity reactions: including Stevens‑Johnson syndrome.

Use meropenem with careful clinical monitoring and appropriate laboratory assessments.

• Renal function: adjust dose in patients with impaired clearance.
• Hepatic function: monitor liver enzymes during prolonged therapy.
• Allergic reactions: avoid in individuals with known carbapenem hypersensitivity.
• Valproic acid co‑administration: may reduce seizure control, consider alternative therapy.
• Pregnancy and lactation: safety not established; weigh benefits against potential risks.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze.

Meropenem can interact with several medicines, requiring vigilance.

Major Interactions (Avoid)

• Valproic acid: reduces antiepileptic efficacy, may precipitate seizures.
• Aminoglycosides or other nephrotoxic agents: increase risk of renal injury.
• Warfarin: may potentiate anticoagulant effect, requiring INR monitoring.
• Probenecid: can raise meropenem plasma levels, increasing toxicity risk.

Moderate Interactions (Monitor Closely)

• Diuretics: may affect electrolyte balance and renal clearance.
• Other broad‑spectrum antibiotics: potential for antagonism or additive toxicity.
• Oral contraceptives: theoretical reduction in efficacy, advise additional contraception.