What route is NOT used for administering ertapenem?

Ertapenem is a type of carbapenem antibiotic that is typically administered via intravenous (IV) or intramuscular (IM) routes to ensure effective delivery and absorption in the bloodstream for systemic infections. The intraosseous route, while less common, is sometimes used in emergency situations when IV access is difficult.

The oral route is not used for administering ertapenem because the antibiotic is not formulated for oral delivery; it requires parenteral administration to achieve the necessary therapeutic concentrations in the body. Orally administered forms of medication are often subjected to metabolism in the gastrointestinal tract and liver, which can significantly reduce their efficacy. Therefore, the correct answer highlights the route that is not applicable for administering ertapenem.