The granules we used came in 15mg packets (I think that's the size). We did 5mg 2x/daily. So I eye-measured about a third of the packet for each dose. I mixed it in a tiny cup with a little bit of water, and used a syringe to suck it up and into his mouth. He really got to liking the taste. It dissolves pretty easy but the granules themselves stay whole, you don't break them up because they have to go to the stomach whole. Time-release or something like that. Sometimes the granules got stuck in the syringe, which was a PITA.
If I could choose, I'd go to the pharmacy every two weeks for the flavored stuff. Although... the granules were so much easier for trips/being out of the house. Tough choice!!