Merrobe 1 g Injection Merrobe 1 g is an injectable antibiotic containing meropenem, a broad-spectrum antibacterial medicine used for serious infections caused by susceptible bacteria. It works by interfering with the formation of the bacterial cell wall, which prevents the bacteria from maintaining their structure and leads to their destruction. It is administered intravenously under medical supervision and is generally used for severe infections requiring hospital-level antibiotic treatment.