What is an elixir?

An elixir is defined as a clear liquid that contains a drug dissolved in a mixture of alcohol and water. This formulation is specifically designed for the purpose of solubilizing the drug to enhance its absorption and efficacy when administered. The presence of alcohol can help improve the palatability of the medication and aid in its preservation.

In contrast, the other options describe different pharmaceutical forms. A clear liquid made up of a drug dissolved in oil does not match the definition of an elixir, as elixirs require both alcohol and water in the solution. A solid capsule containing a powdered drug pertains to oral dosage forms that are not liquids at all. Similarly, aerosol medications are typically delivered as fine sprays or mists and do not conform to the characteristics of an elixir. Therefore, the definition matches best with the description of an elixir as a clear liquid consisting of a drug in alcohol and water.