Let's say someone wants to study biochemistry and his main goal is to do research in drug design (development of new drugs). So, his main interests concerns with Pharmacology, right?
However, there are few undergraduate programs available in Pharmacology (there are some in England and other European countries) because most of Pharmacology programs are graduate programs.
So, the question is, what should this person do?
Go directly to a undergraduate pharmacology program.
Take another undergraduate program. In this case, what would that be? Chemistry? Medicine? Biochemistry?