Which medical abbreviation signifies "Intramuscular"?

The abbreviation that signifies "Intramuscular" is indeed "im." In medical terminology, "im" specifically refers to the administration of a medication through an injection into the muscle. This route allows for more rapid absorption of the medication into the bloodstream compared to other routes, such as oral or subcutaneous, making it an important method for delivering certain types of medications.

Other choices are used for different terms: "pr" stands for "per rectum," which indicates medications administered via the rectum; "po" signifies "per os" or "by mouth," referring to oral administration of medications; and "od" typically means "once daily” or can denote "odontal," but in a medical context, it generally refers to administration frequency. Understanding these abbreviations not only aids in accurate communication within healthcare settings but also ensures patient safety through proper medication administration.