Which process is used for reducing the size of particles and incorporating solids into lotions or creams?

Levigation is the process used for reducing the size of solid particles and incorporating them into creams or lotions. This method involves the use of a small amount of liquid (which is typically a suitable solvent) to create a paste from the solid material, allowing for the smooth dispersion of the solid into the final formulation. By doing this, the particles are effectively reduced in size and evenly distributed, enhancing the texture and stability of the product.

In the context of pharmacy and compounding, achieving a uniform particle size is essential for the effectiveness and aesthetic quality of topical preparations. Proper levigation helps to ensure that the active ingredients are properly incorporated, which can influence the therapeutic efficacy and the sensory properties of the lotion or cream.