Which dosage form is similar to an ointment but has a thicker consistency?

The correct answer is paste. A paste is a semi-solid dosage form that shares similarities with ointments but has a thicker consistency. This thickness allows pastes to adhere better to the skin and provide a prolonged effect, making them suitable for specific therapeutic applications where a more substantial barrier or protective layer is needed. Pastes are often used for conditions that require a more potent action or protection against environmental factors, such as diaper rash or in certain dermatological treatments.

In contrast, other choices like elixirs are liquid formulations intended for oral administration and do not have the same thick consistency. Ointments, while they have a similar base, are typically less viscous than pastes. Creams are emulsions that are lighter than both ointments and pastes, often used for moisturizing or providing a lighter application to the skin. Therefore, the unique thick consistency of a paste makes it the most suitable answer in this context.