FPGEE for National Association of Boards of Pharmacy (NABP) Practice Exam 2026 - Free NABP Practice Questions and Study Guide

Calamine lotion is classified as an oil in water emulsion due to its formulation and the nature of its ingredients. An oil in water emulsion consists of tiny droplets of oil dispersed in a water phase, which is characteristic of many topical preparations designed for dermatological use.

In the case of calamine lotion, the active ingredients and the oil components are incorporated into a predominantly aqueous base, allowing for easy spreading on the skin and effective delivery of the medication. This type of emulsion provides a lightweight, non-greasy feel when applied, which is particularly important for treatments designed to soothe the skin, such as in cases of itching or irritation from conditions like chickenpox or insect bites.

Understanding the classification of emulsions helps in recognizing their physical properties and implications for use, such as absorption, texture, and the ease of application. This context enhances the understanding of why calamine lotion functions effectively in its intended role as a topical treatment.