From the UCSF website....
Reapplicants: You must provide
at least 1 but no more than 4 new recommendations. If you fail to submit at least 1
new recommendation, your application will be considered incomplete and is subject to cancellation. If you submit more than 4 recommendations, additional ones will be discarded.
http://pharmacy.ucsf.edu/pharmd/admissions/steps/2/pharmcas/rec/
Simple google searches are usually the answer to everything.