Meropenem

Acute bacterial meningitis stands among the indications in the AEMPS Archifar label, with its own higher dose: inflamed meninges let meropenem into the cerebrospinal fluid, but the concentration has to be kept high. Empirical first-line therapy in Europe usually differs – ceftriaxone with vancomycin, plus ampicillin where listeriosis is a risk. Meropenem comes in when a cephalosporin does not fit: severe allergy to it, hospital-acquired meningitis after neurosurgery, or cultured flora resistant to cephalosporins. Carbapenems carry a rare adverse effect that matters here: the label lists seizures among uncommon reactions, and in a patient with meningitis they are easy to read as the illness itself. Valproic acid in this combination is followed by drug levels.

ICD-10: G00

Complicated intra-abdominal infection is listed outright among the indications in the AEMPS Archifar label. The reasoning sits in the spectrum: with perforation or an anastomotic leak the peritoneal cavity receives mixed flora, and meropenem covers enteric gram-negative rods together with anaerobes in a single drug, with no metronidazole added. This is not first-line for every appendicitis: the carbapenem is chosen for hospital-acquired infection, recent antibacterial therapy, severe illness or known carriage of resistant flora. The antibiotic does not replace source control – without surgery or drainage it does not rescue. Course length is counted from the day of adequate drainage, not from the first dose.

ICD-10: K65.0

Complicated urinary tract infections appear in the AEMPS Archifar label. Complicated means infection over a stone, a stent, a catheter, a neurogenic bladder, prostatic enlargement or after a urological procedure, and the flora there is more often resistant. Meropenem is picked after culture, when an extended-spectrum beta-lactamase producer grows or the patient has just failed a cephalosporin and a fluoroquinolone. Plain cystitis in a healthy woman needs no carbapenem: fosfomycin, nitrofurantoin and trimethoprim do the work. Once the patient improves and the isolate is susceptible, intravenous meropenem steps down to a narrow oral agent, which shortens the hospital stay and eases resistance pressure.

ICD-10: N10 · ICD-11: GB51

Meropenem is a hospital carbapenem, and in gram-negative sepsis it goes in where earlier beta-lactams no longer hold the flora: extended-spectrum beta-lactamase producers, Pseudomonas aeruginosa, Acinetobacter. The AEMPS Archifar label names bacteraemia associated with a severe infection as a separate entry and allows the drug from 3 months of age. Dosing follows creatinine clearance, and in renal failure the interval stretches. An extended 3-hour infusion keeps the concentration above the MIC longer than a bolus, and severe sepsis is dosed that way. Once cultures return, the regimen narrows: the carbapenem stays only for confirmed resistant flora. If the patient takes valproic acid, the treating neurologist hears about the meropenem start: the anticonvulsant level collapses within two days.

ICD-10: A41.5 · ICD-11: 1G40