But if taken too soon after using a full opiate agonist (heroin, fentanyl,
methadone, Dilaudid, Norcos, Vicoden, Oxy, etc.,)
Subutex itself CAN cause precipitated withdrawal because it will act as an antagonist. I can tell you this from my own experience, I have suffered through PWs and it was kind of like, instantly going from feeling normal to instantly feeling like Day #2 of full blown heroin withdrawals in 5 minutes and nothing but shooting an ass load of Dilaudid would help it.