What is a liquid suspension?

A liquid suspension, such as in the case of choice D, is a type of liquid drug form where the drug particles are not completely dissolved and instead settle to the bottom of the liquid. This characteristic differentiates it from a solution where the drug is completely dissolved evenly throughout the liquid. Liquid suspensions require shaking before administration to ensure an even distribution of the medication.

Choices A, B, and C do not accurately describe a liquid suspension. Choice A describes a solution, where the drug is evenly dissolved in the liquid. Choice B refers to a sustained-release formulation where small amounts of the drug dissolve over time. Choice C relates to the properties of a topical cream or ointment, indicating softening and soothing effects on the skin, rather than the characteristics of a liquid suspension.