Why do the word SHAKE WELL BEFORE USE on a bottle of medicine indicate that the medicine is a suspensions?

The phrase "SHAKE WELL BEFORE USE" indicates that the medicine is a suspension because it contains solid particles dispersed in a liquid. Over time, these particles can settle at the bottom, leading to an uneven distribution of the active ingredients. Shaking the bottle redistributes the particles, ensuring that each dose contains the correct concentration of the medication. This is essential for the effectiveness and safety of the suspension.