In the supply of medications, the medical profession will be reliant on continued frictionless transport services through the ports whether that be rail air or sea.
In the above, those medical supplies come from many different sources on many different logistic services both into and out of this country. Therefore, If there were to be disruption through the ports, then a central authority would need to be in place to coordinate all the present operations that are involved with the transport of medical supplies across Europe into single central operation, which would be a major task requiring much planning.
However, no such planning it would seem is in place according to the government "technical notices" distributed to the transport industry. Indeed the road haulage industry has stated that the above notices are entirely out of touch the situation of uncertainty facing the road hauliers with less than five months until the UK leaves the European Union.
Of course, the logistics planners within the transport industry could attempt to set up express central hubs for medical supplies themselves, but that would need the co-operation of very many transport operators throughout both Europe and here in Britain and would be a costly operation.
However, a trade deal could be signed at any time before Brexit actually takes place, and therefore no transport company is going to engage in the heavy expenditure involved in setting up the above operation(s) when the signing of a trade agreement would negate all that expenditure immediately a deal is agreed.
This thread is only discussing medical supplies, but there are many other essential services that require a constant logistics supply which could not be sustained if there was disruption through the ports following Brexit. Therefore I do not believe that the medical profession or any other trade or industry can truly state that their operations will remain unaffected following Brexit.
The truth is that no one knows what the situation will be on the 30th of March next year as long as all the present uncertainty prevails. However, the longer the present situation of uncertainty continues, the more serious the transport problem will become.