Meropenem Enexi (Meropenem Anhydrous)

• Meropenem Enexi is a broad‑spectrum carbapenem used to treat infections caused by susceptible bacteria in several organ systems.
• Complicated intra‑abdominal infections: provides rapid bacterial eradication and clinical cure.
• Complicated urinary tract infections: eliminates resistant Gram‑negative pathogens.
• Hospital‑acquired pneumonia: achieves high lung tissue concentrations for effective therapy.
• Septicemia: offers bactericidal activity against bloodstream infections.
• Meningitis: penetrates the cerebrospinal fluid to treat central nervous system infections.

• Meropenem binds with high affinity 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, cell lysis, and bacterial death. Its broad spectrum includes many Gram‑positive, Gram‑negative and anaerobic organisms, and it is resistant to most β‑lactamases.

Adverse reactions may occur with any antimicrobial therapy and should be monitored.

Common Side Effects

• Nausea or vomiting
• Diarrhea, including mild Clostridioides difficile colonisation
• Rash or mild skin erythema
• Headache
• Elevated liver enzymes
• Injection‑site phlebitis or discomfort

Serious or Rare Side Effects

• Seizures, especially in patients with renal impairment
• Severe Clostridioides difficile‑associated colitis
• Anaphylactic or anaphylactoid reactions
• Acute renal failure or worsening renal function
• Hematologic abnormalities such as neutropenia or thrombocytopenia
• Stevens‑Johnson syndrome or toxic epidermal necrolysis

• Use meropenem with careful clinical assessment and monitoring.
• Renal impairment: adjust dose based on creatinine clearance.
• Seizure risk: avoid in patients with a history of epilepsy or CNS disorders.
• Hypersensitivity: discontinue if allergic reactions develop.
• Antimicrobial stewardship: limit use to confirmed susceptible infections.
• Pregnancy and lactation: weigh benefits against potential risks; consult specialist.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze.

Meropenem may alter the pharmacokinetics of several co‑administered drugs.

Major Interactions (Avoid)

• Valproic acid: carbapenems reduce serum valproate levels, risking seizure breakthrough.
• Oral contraceptives: may decrease hormonal efficacy, leading to unintended pregnancy.
• Probenecid: can increase meropenem plasma concentrations, raising toxicity risk.

Moderate Interactions (Monitor Closely)

• Loop diuretics: combined nephrotoxic potential requires renal function monitoring.
• Aminoglycosides: additive renal toxicity; adjust dosing and monitor creatinine.