Italian to English Bus/Financial Manufacturing pharmacy medication management

This is a medical question in a sense, but I thought I would have more luck (and more responses) if I asked it as a Manufacturing question.

I'm translating the CV of a pharmacist involved in a clinical trial of a medication. At one point in describing his work experience, he writes:

"... ho avuto modo di occuparmi di: gestione dei farmaci assistenziali *a scorta ed in transito*. I've already asked about "farmaci assistenziali" (any suggestions would be appreciated, however) ... but I don't know how to translate this "a scorta ed in transito" segment. For "a scorta" I think he means "in stock" ... but I don't understand the way it contrasts with "in transito".

Please help me understand what he means here, and how we would say it in English (US English, in case it makes a difference).

Grazie dell'aiuto!