Where can we store Drug vehicle of a medication in FHIR?

I am receiving drug vehicle information from a CCD, which I need to store in FHIR. Can anyone advise where can I store this information?

Drug vehicle (e.g., saline, dextrose,Aerosol) describes the vehicle or medium used to administering a medication. e.g Medications which are delivered via an asthma inhaler uses aerosol as a medium.

It looks to me like you’re asking about two different things - route of administration, and excipient ingredients ?

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