At the UC's, they have their own forms that they ask the recommenders to fill out. Although it is alright to use your school's letter service, they much prefer that the recommenders use the forms the pharmcy schools provided because the admission committes want certain questions answered that might not be included in the forms your school uses to evaluate you. On the forms, there are check boxes where you can either waive your right to have access to the recommendation letters or not. There is only one catch: if you got accepted and did not waive your right, then you get to see the letters. If you were denied admission, it does not matter whether you waived your right for access to the recommendation letters or not because you won't be able to see them either way. Also, since there are lots of materials coming into the admission office, the UC's prefer that you collect all three letter of recommendations and send them in along with the required fee and forms to avoid materials being misplaced or lost. By the way all three letters are supposed to be sealed and signed by the recommenders.
If you are pretty close with the person you are asking a letter of recommendation from, sometimes he/she will offer you an opportunity to read the letter, so you can add details that he/she might have missed before it is sealed. However, it's always a good idea to have a CV along with a coverletter when you submitt the necessary forms to the recommender. By doing this, you are showing to the recommender you are serious about your career choice and have thought out about what you did in the past that will make you a good applicant for pharmacy school. Also, some recommenders, especially if they are instructors, might have dozens of students asking them for letters of recommendations. By having a coverletter, which clearly states why you want to pursue pharmacy and what you hope to accomplish, and CV, you give the recommenders more material to work with, which, hopefully, in the end will paint a more detailed picture of who you are and what others think about you and your work to the admission committee.