I do not know whether the pharmacist is too busy with administrative duties or what, but I agree the information sheet is often not very adequate.

Some doctors don't know all the medications either(drug manufacturers are known to give free samples to doctors for prospective customers.)

I would think a pharmacist would know more.

There is a big book pharmacy reference book that comes out every year, a pharmacy would have that is pretty detailed(of course it is filled with fine print.)