In this context, the "suspension" is the liquid the antibiotic is mixed with, in order to make taking it easier or more effective. Kids, for example, take liquids better than pills. So they're prescribed antibiotics in suspension.
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Because they are suspensions.
A "suspension" is a type of mixture where there are solid or liquid particles suspended in a different liquid. This is different from a solution, where the solute is actually dissolved in the solvent.
Suspensions tend to settle out over time; solutions don't. If the bottle says to shake well before using, it's probably a suspension.
Emulsions are a specific type of suspension where there's some emulsifying agent to keep the suspended particles from settling out. Mayonnaise is an emulsion where the emulsifying agents (lecithin and other proteins) are naturally present in egg yolk.