The EU market accounts for 25% of all global medicines sales, when we break away and become a smaller separate market, companies may very well priorities bigger markets to introduce their medicines into over the UK.  The NHS may as a result struggle to access medicines and combined with the drop, in value of the pound against the euro and the dollar what we can access will cost more.  The NHS is already struggling to work within its budgets and targets this will make things worse. The NHS must be considered in future Brexit negations, or we may see  shortages of medicines in the future.