Which dosage form has a stiffer consistency and is not suitable for hairy surfaces?

• A. Ointment
• B. Paste
• C. Transdermal
• D. Cream

Answer: (B)

The idea being tested is how the thickness and spreadability of a topical dosage form affect its suitability for hairy skin. A paste has a stiffer consistency because it contains a high solids content and thick base, making it less easy to spread. On hairy surfaces, that stiffness makes it cling to hair shafts instead of spreading smoothly, often leaving a rough, hard-to-remove residue and causing discomfort. Ointments and creams are softer and spread more readily, so they cover hairy areas more evenly and comfortably. Transdermal formulations are patches designed to stick to the skin, with viscosity not being the main factor, and they’re chosen for adhesion considerations rather than stiffness. Therefore, the stiffer paste is the least suitable for hairy surfaces.