Just a quick correction...Percocet is oxycodone with
Acetaminophen, and Percodan is Oxycodone
with Aspirin, not Tylenol. There are other, less common combinations, like Vicoprofen, which would be Hydrocodone with Ibuprofen instead of Tylenol (Acetaminophen).
Vicodin, Norco, Lortab are all Hydrocodone.
Dilaudid comes both in oral and injectable forms, with doses starting at usually 1 mg.
Fentanyl patches typically start at 25 mcg/hr (micrograms). I have seen lower doses, 12.