Which four components must pharmaceutical suspensions possess?

• A. Therapeutic Efficacy, Chemical Stability, Physical Stability, Esthetic Appeal
• B. Viscosity, Particle Size, Density, Odor
• C. pH, Osmolarity, Sterility, Taste
• D. Color, Taste, Aroma, Texture

Answer: (A)

A pharmaceutical suspension must support delivering the drug safely and effectively while remaining stable and acceptable to the patient. Therapeutic efficacy ensures the drug dose in the suspension provides the intended clinical effect. Chemical stability means the active ingredient stays intact and potent over the product’s shelf life, resisting degradation or reactions. Physical stability ensures the dispersed particles stay evenly distributed and the suspension resists settling, caking, or phase separation. Esthetic appeal addresses patient acceptance—appearance, taste, odor, and mouthfeel—so the product is easy and pleasant to use, which supports proper dosing.

The other options focus on individual properties (like viscosity or particle size, pH or sterility, or color and flavor) rather than the four overarching aspects that define a usable suspension. Hence, the best answer is Therapeutic Efficacy, Chemical Stability, Physical Stability, Esthetic Appeal.