Meropenem Dr. Eberth (Meropenem Trihydrate)

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

• Complicated intra‑abdominal infections: provides coverage against mixed aerobic and anaerobic pathogens.
• Hospital‑acquired pneumonia and ventilator‑associated pneumonia: effective against resistant Gram‑negative organisms.
• Complicated urinary tract infections: treats infections caused by multidrug‑resistant Enterobacteriaceae.
• Bacterial meningitis: penetrates the cerebrospinal fluid to eradicate causative bacteria.
• Sepsis and febrile neutropenia: offers rapid bactericidal activity in critically ill patients.

• 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 lysis. Its high affinity for a broad range of PBPs gives it activity against many Gram‑negative, Gram‑positive, and anaerobic organisms, including those resistant to other β‑lactam antibiotics.

Adverse reactions may occur with meropenem therapy.

Common Side Effects

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

Serious or Rare Side Effects

• Seizures: especially in patients with renal impairment or CNS disorders.
• Clostridioides difficile‑associated diarrhea: can be severe and life‑threatening.
• Anaphylaxis: acute hypersensitivity reaction requiring immediate treatment.
• Severe neutropenia: marked reduction in white blood cells.
• Thrombocytopenia: low platelet count leading to bleeding risk.
• Renal toxicity: acute kidney injury in susceptible individuals.

Careful assessment and monitoring are required when using meropenem.

• Renal impairment: adjust dose based on creatinine clearance.
• Hypersensitivity: avoid in patients with known carbapenem or β‑lactam allergy.
• Neonates and infants: use only under specialist supervision.
• Seizure risk: monitor neurologic status, especially in patients with CNS disorders.
• Concomitant valproic acid: may reduce serum valproate levels, increasing seizure risk.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze.

Meropenem may interact with other medicines, requiring vigilance.

Major Interactions (Avoid)

• Valproic acid: meropenem reduces valproate levels, risking seizure breakthrough.
• Other carbapenems: additive neurotoxicity, especially seizures.
• Aminoglycosides: combined nephrotoxic potential.

Moderate Interactions (Monitor Closely)

• Warfarin: may alter INR, requiring coagulation monitoring.
• Oral contraceptives: possible reduction in efficacy, advise backup contraception.
• Loop diuretics: may enhance renal clearance, adjust dosing if needed.