Which semisolid preparation contains medicinal agents dissolved or dispersed in either water-in-oil or oil-in-water emulsions or in water-washable bases?

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Multiple Choice

Which semisolid preparation contains medicinal agents dissolved or dispersed in either water-in-oil or oil-in-water emulsions or in water-washable bases?

Explanation:
Creams are emulsions—either oil-in-water or water-in-oil—and can be in bases that are water-washable. This means the medicinal agent can be dissolved or dispersed within the emulsified system, and the entire preparation can be rinsed off with water. This combination fits the description best, whereas ointments are typically oleaginous and not water-washable, gels are thickened aqueous systems rather than emulsions, and pastes are stiff, high-solids formulations that are not water-washable.

Creams are emulsions—either oil-in-water or water-in-oil—and can be in bases that are water-washable. This means the medicinal agent can be dissolved or dispersed within the emulsified system, and the entire preparation can be rinsed off with water. This combination fits the description best, whereas ointments are typically oleaginous and not water-washable, gels are thickened aqueous systems rather than emulsions, and pastes are stiff, high-solids formulations that are not water-washable.

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