Based on the active ingredient Ceftriaxone, which is the main component of Monocef injection, a 1-milligram dose is not the standard preparation for this potent antibiotic. The standard dosage is typically 1 gram or 1,000 milligrams, intended for injection, not as a 1 mg dose. Monocef is a brand name for Ceftriaxone in many parts of the world.