In drug administration, what does the term vehicle mean?

• A. The substance that contains the drug
• B. The route of administration
• C. The equipment used to administer the drug
• D. The different strengths available for the drug

Answer: (A)

In drug administration, the vehicle is the medium that carries the drug. It is the substance in which the active drug is dissolved or suspended so it can be given to the patient, such as sterile saline, sterile water, or sterile oil. The vehicle helps with dispersion, stability, and compatibility with the chosen route of administration, and it can influence absorption and local tolerability. It is not the route of administration, the equipment used to deliver the drug, or the drug’s strength or concentration.