A cream is typically a semisolid preparation composed of medicinal agents dispersed in what type of system?

• A. Pure solvent solution
• B. Gel network in wax
• C. Water-in-oil or oil-in-water emulsion
• D. Simple oil base

Answer: (C)

Creams are semisolid preparations created by dispersing the medicinal agents in an emulsion system, where droplets of one liquid are dispersed in another. This means the dispersed phase is either water droplets in an oil continuous phase (water-in-oil) or oil droplets in a water continuous phase (oil-in-water). This emulsion structure gives creams their characteristic spreadability, cooling feel, and ability to carry both lipophilic and hydrophilic components. It also explains why a cream is not a pure solvent solution (that would be a liquid with dissolved substances, not a semisolid) and not a gel network in wax (which would be a gel) or a simple oil base (which lacks the dispersed aqueous phase). The emulsion basis is essential to achieve the typical texture and properties of creams.