Merinfec (Meropenem Trihydrate)

Meropenem is a carbapenem antibiotic used to treat severe infections across several organ systems.

• Complicated intra‑abdominal infections: provides broad‑spectrum coverage against mixed aerobic and anaerobic pathogens.
• Complicated urinary tract infections: eradicates resistant Gram‑negative organisms causing pyelonephritis.
• Hospital‑acquired pneumonia including ventilator‑associated pneumonia: targets multidrug‑resistant respiratory pathogens.
• Bacterial meningitis: achieves therapeutic concentrations in cerebrospinal fluid for central nervous system infections.
• Sepsis and febrile neutropenia: offers rapid bactericidal activity in systemic infections.

• 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 cell lysis. Its high affinity for a broad range of PBPs underlies its activity against many Gram‑negative, Gram‑positive and anaerobic organisms.

Common Side Effects

• Nausea: mild to moderate gastrointestinal upset.
• Diarrhea: may be watery and self‑limiting.
• Rash: erythematous skin eruptions.
• Headache: transient and usually resolves.
• Infusion site phlebitis: local irritation at IV site.
• Elevated liver enzymes: mild transaminase rise.

Serious or Rare Side Effects

• Seizures: especially in patients with renal impairment or CNS disorders.
• Anaphylaxis: severe allergic reaction requiring immediate intervention.
• Clostridioides difficile‑associated colitis: antibiotic‑related intestinal infection.
• Acute renal failure: worsening kidney function.
• Thrombocytopenia: reduced platelet count.
• Hepatic dysfunction: jaundice or hepatitis.

Meropenem should be used with caution in specific clinical situations.

• Renal function: adjust dose in patients with impaired renal clearance.
• Allergy history: avoid in individuals with known hypersensitivity to carbapenems or other β‑lactams.
• Seizure risk: monitor closely in patients with a history of seizures or CNS disorders.
• Pregnancy and lactation: prescribe only when the potential benefit justifies the potential risk to the fetus or infant.
• Drug interactions: review concomitant medications for possible interactions.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Meropenem may interact with several medications; careful assessment is required.

Major Interactions (Avoid)

• Valproic acid: may reduce plasma concentrations, increasing seizure risk.
• Probenecid: can increase meropenem levels, raising toxicity potential.
• Nephrotoxic agents (e.g., aminoglycosides): combined use may exacerbate renal impairment.

Moderate Interactions (Monitor Closely)

• Loop diuretics: monitor renal function and electrolytes.
• Anticoagulants (e.g., warfarin): observe coagulation parameters for changes.
• Other anticonvulsants: assess seizure control and adjust therapy as needed.