What should be done before using a suspension?

Before using a suspension, it is essential to shake it well. Suspensions are mixtures where solid particles are dispersed in a liquid but are not fully dissolved. Over time, these solid particles can settle at the bottom of the container due to gravity, leading to an uneven distribution of the active ingredients within the liquid. Shaking the suspension ensures that the particles are evenly mixed throughout the liquid, providing a consistent dose when administered.

In contrast, other options may not apply universally to suspensions. For instance, storing in a refrigerated area may be specific to certain medications but is not a general requirement for all suspensions. Heating to a specific temperature can alter the composition or efficacy of some suspensions, and mixing with oil is not a common practice for suspensions, as they are typically used in liquid form without additional solvents. Therefore, shaking before use is a fundamental step to ensure proper delivery of the medication.