Meropenem (Meropenem Trihydrate)

• Meropenem is a broad‑spectrum carbapenem used for serious bacterial infections in the hospital setting.
• Complicated intra‑abdominal infections: achieves clinical cure and bacterial eradication.
• Complicated urinary tract infections: resolves infection and prevents recurrence.
• Hospital‑acquired pneumonia: provides rapid bacterial clearance and improves survival.
• Ventilator‑associated pneumonia: restores lung function and reduces mortality.
• Meningitis: penetrates the cerebrospinal fluid to eradicate causative pathogens.
• Febrile neutropenia: offers prompt bactericidal activity in immunocompromised patients.

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

Adverse reactions may occur with meropenem therapy.

Common Side Effects

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

Serious or Rare Side Effects

• Seizures: especially in patients with renal impairment or CNS disorders.
• Anaphylaxis: severe hypersensitivity reaction requiring immediate treatment.
• Clostridioides difficile‑associated diarrhea: can lead to colitis.
• Neutropenia: marked reduction in white blood cells.
• Thrombocytopenia: low platelet count increasing bleeding risk.
• Acute renal impairment: worsening kidney function in susceptible individuals.

• Use meropenem with careful clinical monitoring.
• Renal function assessment: adjust dosing in patients with impaired renal function.
• Allergy history: avoid in patients with known hypersensitivity to carbapenems or other β‑lactams.
• Seizure risk: monitor patients with central nervous system disorders or receiving high doses.
• Pregnancy: use only if the potential benefit justifies the potential risk to the fetus.
• Concurrent nephrotoxic drugs: monitor renal parameters closely.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Meropenem may interact with several concomitant medications.

Major Interactions (Avoid)

• Valproic acid: reduces serum levels, increasing seizure risk.
• Probenecid: raises meropenem concentrations, heightening toxicity.
• Aminoglycosides: additive nephrotoxicity, monitor kidney function.

Moderate Interactions (Monitor Closely)

• Loop diuretics: may affect renal clearance, watch electrolytes.
• Warfarin: potential alteration of INR, monitor coagulation.
• Oral contraceptives: possible reduction in efficacy, advise backup contraception.