Although I haven't started p-school yet, I do know many friends ranging from UCSF, Loma Linda, Touro Univ (basically most CA schools) and Midwestern-Chicago, USN, Western and UW-Madison.
If you asked this questions, you will get many different answers. Although majority of pharmcy schools are design to prepare students for all areas of pharmacy, some schools have a "harder" approach.
3 vs 4 yrs. Block scheduling vs semesters vs quarters. One class at a time vs 5 classes at a time. Tests every other Monday vs tests whenever professor feels like it.
My point is, not all pharmacy schools are that hard. My friends at Touro, UCSF, Midwestern-Chicago, Pacific University, USN, and Western all say school is hard but very doable. They study every other day and usually take a Saturday off to party and relax. They study ~2-3 hours per night and around 5-6 hrs before tests. They are enjoying their time and learning a lot. Hell some of my friends abrely study and get by with C's and that's fine with them. That's because their school's approach allows to them slack off but as long as they get the main ideas of the section, they'll be a competent pharmacist.
Yet my friends at Loma Linda and UW-Madison seem to tell the same story as the OP. My girlfriend as we speak is studying at a 24 hr coffee shop and is pulling an all nighter. She does this at least 2-3 times a week and I feel really bad for her. Her professors aren't very clear on what's expected on the test so she studies EVERYTHING to cover all bases. IMO, this approach is unfair. It gets as specific as "that random fact on that little box in the upper right hand corner of page 87." If you overlooked it because you were so focused on the main material (which was not tested on because it was so "obvious") then that can be 5% off your test score.
"If you want us to learn about pain receptors and drugs affecting them, then don't randomly test us on where those drugs originated from or other useless facts like that." Not sure if my gf was exagerrating but you get the idea.
The "easier" schools seem to have professors upfront with what's expected. No it's not all memorizing nor are they spoon fed the material but they know if something in the text/lecture notes is irrelevent.
Ok, I'm sure I told too many stories but every school is set up differently. The best way to know if to ask! I know this info from asking friends of friends, student hosts and random students during my downtime on my interviews, and also this message board. If you have multiple acceptances, it's best to weigh the cost and location, but also decide if the school's approach to teaching is a good fit for you.
To the OP, good luck with school. My advice is to just tough it out and only leave if you can't hack it.