What is the definition of a suspension in pharmacy terms?

In the context of pharmacy, a suspension is defined as a mixture in which solid particles are dispersed throughout a liquid but are not dissolved. These solid particles can sediment over time, which means they settle at the bottom of the container if the mixture is left undisturbed. Consequently, it is essential for a suspension to be shaken or agitated before use to ensure that the solid components are evenly distributed throughout the liquid. This characteristic is crucial for achieving an accurate dosage and effectiveness of the medication when administered.

This definition aligns well with the concept of suspensions in pharmaceutical formulations, highlighting the importance of proper preparation for effective use. Other options, while related to mixtures and solutions, do not accurately describe the nature of a suspension. For instance, a liquid solution with proteins suspended in it refers more specifically to a colloidal solution, while the combination of oil and water pertains to emulsions. Lastly, a gaseous product contained within a liquid does not capture the essence of a suspension either. Understanding these distinctions underlines why the definition of a suspension emphasizes the need for shaking before use.