Hi!
I recommond you ckeck out pharmacy schools websites or contact them to be sure how many LOR's they need and who do they want from.
For example, the school I'm interested in says that they need total of 2 LORs; 1 from Science Professor and 1 from the current Employer. The other school wants 3 LORs, so it's really depends on each school.
So, contact the schools that you're instered in to measure how many LORs that want and from who(science prof, employer, high school teacher, etc...).