No, I don't think so. There are presumably some cases of breakthrough drugs that enable people to deal with health problems that previously could not be treated at all, and in this situation pharmaceutical companies are effectively in a position to blackmail the individual buyers, including individual countries. However, in most cases new drugs that are introduced are improvements on existing drugs. The ability of buyers to drive a bargain depends on the extent to which they are dealing with absolutely indispensable drugs that are the only ones available for certain health problems.
On September 27th, 2016. See this statement in context.