What type of preparation is an ointment?

An ointment is classified as a semi-solid preparation because it possesses a unique consistency that allows it to be easily spread on the skin while also providing a barrier for the medication to be absorbed. Semi-solid preparations, like ointments, have a viscosity that is greater than liquids but less than solids, making them ideal for topical applications. This property allows ointments to deliver active ingredients effectively while also moisturizing the area where they are applied, which can enhance the treatment process for various skin conditions. The nature of an ointment allows for both the drug's absorption and prolonged contact with the skin, which is critical for therapeutic effectiveness.