Good question. I have one more term left and I'm debating whether or not to take the final term of general physics or a 300 level course in biochem. I'd really much rather take the biochem, trouble is one of the schools i'm thinking of applying to requires 3 terms of physics. I bet relativity and optics come in real handy in Pharm school...
Take biochem if you can. You'll have to know all those pathways and enzymes in pharm school and if you can get it out of the way now, you won't have to learn them when you are trying to learn a million other things. Also, take genetics with a lab if you get a chance. I found it extremely helpful for a number of my pharmacy classes.
I don't really think that if I had taken Biochem in undergrad that I would have been better off in the pharm school biochem class. If you can't fit it into your schedule or if you'd rather take a different class, I would NOT stress about it.
I think it's probably supposed to be harder, a little more in depth, and maybe more specific to the "pharmacy" aspect.
The biochem course at Midwestern-glendale was really interesting and you'll love Dr. Parmley. She's a great teacher and works her butt off trying to make the stuff easier to understand. She holds test review sessions and makes great test review handouts because she knows the material goes beyond some people's brains.