Merocarb (Meropenem Anhydrous)

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

• Complicated intra‑abdominal infections: provides bacterial eradication and clinical cure in patients with perforated or necrotic abdominal conditions.
• Complicated urinary tract infections: eliminates uropathogens, including resistant strains, to resolve infection.
• Hospital‑acquired pneumonia: achieves lung tissue concentrations sufficient to treat Gram‑negative and Gram‑positive pathogens.
• Septicemia: rapidly reduces bloodstream bacterial load, supporting hemodynamic recovery.

• Meropenem inhibits bacterial cell wall synthesis by binding to penicillin‑binding proteins (PBPs) across a wide range of Gram‑negative and Gram‑positive organisms. This binding disrupts the transpeptidation step of peptidoglycan cross‑linking, leading to weakened cell walls, osmotic instability, and ultimately bacterial lysis and death.

Adverse reactions may occur with any intravenous antibiotic and should be monitored during therapy.

Common Side Effects

• Nausea: mild to moderate gastrointestinal discomfort.
• Diarrhea: may be watery and self‑limiting.
• Rash: localized skin erythema.
• Elevated liver enzymes: transient increase in AST/ALT.
• Headache: mild, often resolves without intervention.

Serious or Rare Side Effects

• Anaphylaxis: acute hypersensitivity requiring immediate medical attention.
• Seizures: especially in patients with renal impairment or CNS disorders.
• Clostridioides difficile colitis: severe diarrhea due to gut flora disruption.
• Thrombocytopenia: reduced platelet count, monitor CBC.
• Renal toxicity: elevated creatinine, adjust dosing as needed.

Meropenem should be used with caution in specific clinical situations.

• Renal impairment: adjust dose based on creatinine clearance.
• CNS disorders: monitor for neurotoxicity, especially seizures.
• Pregnancy: safety not established; weigh benefits against potential risks.
• Lactation: unknown excretion in breast milk; consider alternatives.
• Hypersensitivity: avoid in patients with known carbapenem allergy.
• Store at ambient temperature: keep in original container, protect from moisture and light.

Meropenem may interact with other agents, altering efficacy or safety.

Major Interactions (Avoid)

• Valproic acid: concomitant use can reduce valproate levels and precipitate seizures.
• Probenecid: may increase meropenem plasma concentrations, raising toxicity risk.

Moderate Interactions (Monitor Closely)

• Aminoglycosides: combined nephrotoxicity; monitor renal function.
• Loop diuretics: potential additive ototoxicity; assess hearing if prolonged.
• Anticoagulants: possible alteration of INR; check coagulation parameters.