What type of formulation contains active ingredients dissolved in one or more liquid solvents?

The formulation you are looking for describes soluble powders. Soluble powders are designed to dissolve in water to create a solution, allowing for the active ingredients to be effectively delivered in a concentrated form. This type of formulation allows for precise dosing, as the user can measure out the weight of the powder to achieve a desired concentration when mixed with a liquid solvent.

In contrast, wettable powders require agitation to remain suspended in solution and do not fully dissolve, making them less effective for certain types of applications where a clear solution is preferred. Flowables contain active ingredients suspended in a liquid carrier, which can provide some benefits in terms of ease of application compared to powders, but they are not purely dissolved. Granules and pellets are solid formulations and do not involve solvents in the same manner as powders that dissolve completely. Thus, when considering formulations that contain active ingredients dissolved in one or more liquid solvents, soluble powders are indeed the correct classification.