What is the purpose of an elixir as a medication?

The purpose of an elixir as a medication is to serve as a clear liquid formulation that typically contains a combination of water and alcohol, along with dissolved medicinal ingredients intended for oral use. Elixirs are designed to enhance the solubility and absorption of certain drugs, making them more palatable and easier to consume for patients who may have difficulty taking solid forms of medication. The presence of alcohol can also help in preserving the solution and improving the taste profile. This delivery method is particularly useful for medications that are not easily soluble in water alone, ensuring effective delivery of the active ingredients.

In contrast, the other choices describe different forms of medication. A semi-solid preparation meant for external application does not fit the elixir description, nor does a form intended for intravenous delivery, which would require a sterile solution. Additionally, solid tablets that dissolve in the stomach represent a whole different category of oral medications. Therefore, the clear liquid nature and intended oral use distinguish elixirs as effective means of medication.