I'm not going to lie, 2nd year pharm was one of the best subjects I've ever taken in uni. It's just this subject we're doing now (Drug drug to markets) is probably the worst I've done. It just falls pale in comparison to anything else I've done so far..
Agree with those above saying second year pharm is a great subject. I'd recommend doing it even if you don't end up doing the major. Some of the content is a little outdated, but whatever.
A couple of friends majored in pharm. Quite a few of them didn't seem to keen on the theory subjects. Heard differing things about the prac subject - not as much work as other prac subjects (no weekly work, for example,) but apparently a bit disorganised.
It's easy enough to structure your course plan so you can leave the choice between pharm and another major until semester 2.