The NHS have published advice for both patients and healthcare staff about what to expect in the event of a "No Deal" Brexit.
Getting your medicines if there's a 'no deal' Brexit is patient focused advice which outlines the steps government is taking to ensure supply and discourages the public from ordering more medicines than they normally would or seeking to stockpile supplies. The webpage will be updated with further advice as needed.
Continuity of supply frequently asked questions are a written for a healthcare professional audience and cover in detail the government's and NHS's plans to ensure continuity of supply, including specific questions on over the counter, shortage medicines and vaccines. The BDA has asked for specific questions on specialist nutrition products to be included in a future version.
https://www.england.nhs.uk/eu-exit/medicines/medicines-faq/