What term is used to describe solutions that are meant for injection in a liquid form?

The term "aqueous solutions for injection" is used to specifically refer to preparations that are in a liquid form and intended to be administered via injection. This designation highlights that these solutions are made with water as the solvent, which is critical for ensuring the compatibility and proper absorption of medications within the body when delivered parenterally.

In pharmaceutical terminology, aqueous solutions are generally favored for injections as they can be easily administered and quickly absorbed into the bloodstream, providing rapid therapeutic action. These solutions typically contain dissolved drug substances, which can be either prepared for immediate use or for reconstitution before administration.

Other options such as topical applications refer to medications intended to be applied directly to the skin or mucous membranes, not for injection. Controlled release formulations are designed to release medication over an extended period, but they are not necessarily in liquid form suitable for injection. Suppositories are solid dosage forms that are intended to be inserted into the rectum or vagina and are designed to dissolve at body temperature; they also do not fall under the category of solutions for injection. Thus, the choice of "aqueous solutions for injection" accurately describes the liquid formulations prepared for the purpose of injection.