Ok, if your friend doesn't know, then Vet science is not for him. The course is hard, and time consuming, and you need to really want to be there to be able to get through.
Also, it's really competitive, and other people will miss out if your friend takes a spot, and if he doesn't really want to be there, then its just a waste of everyone's time, especially his own.
He should do work experience in both fields, and see what appeals. The reality of work is a lot different to what people may perceive it to be, and he needs to be sure before enrolling in either course.
Vets work really hard, for very little pay, and he will have a very large HECS debt at the end. On the other hand, Pharmacy pays better, and the work is less physical, but if he isn't interested in drugs and their interactions / formulations etc, he will be dead bored in a Pharmacy.
Maybe he should consider something more generalist, like a Science degree, so that he can work out where his strenghts lie, and what he is really interested in.