"If the UK had a complete exit from the EU and was not subject to the rules on the free movement of goods then it could become easier for drugs manufacturers to prevent other businesses exploiting price differences between the UK and other European countries. "
So, under the post Brexit conditions,
- if the UK drug price was lower than EU countries we could be prevented from exporting to those countries - reduced drug sales for UK companies
- if the UK price was higher than EU countries UK retailers could be prevented from parallel import of cheaper drugs - higher prices for the NHS and consumers.
Yay! Big win for Brexit