Lumberjack shows scale on some 1:6 scale drug packages I made. The bottles are white electrical tape, wrapped around cores made of glue sticks. I just wrapped the tape thicker for the tops. I put a few layers of tape on the top and bottom to cover up the core. Then I downloaded labels from online, deliberately going for pharmacist bottles, as opposed to prescription bottles. I scaled down the labels, printed them out, then taped them onto the bottles. The bottles are probably oversize, but check it out — you can read the labels, at least enough to see what drugs they are!
As for the Fentanyl patches, those were easy. I just found a picture of a package online. Since it showed both front and back, I found out the actual size of a 50 mcg patch and scaled the patches to approximate size. I printed them, cut them out, folded them in half like greeting cards, then laminated them with tape.