What distinguishes a suspension from other liquid medications?

A suspension is characterized by the presence of solid particles that are dispersed throughout a liquid but not completely dissolved. This unique property means that the particles are suspended in the liquid medium and can settle to the bottom over time if the suspension is allowed to stand still. To ensure an even distribution of the particles throughout the solution before administration, suspensions must be shaken. This ensures that the correct dosage of the medication is delivered, as the amount of active ingredient may vary significantly if the particles have settled.

In contrast, a solution is completely homogeneous, meaning all components are fully dissolved, and does not require shaking. The other options also do not accurately describe a suspension; a suspension is specifically defined by its solid particles and liquid base, rather than being in solid form or sugar-based. The requirement for shaking prior to use is a key aspect of suspensions, making this distinction important in both medicinal preparation and administration.