Hi, Subutex tablet contains Buprenorphine which belongs to the group of medications known as mixed opioid agonist antagonists. It is used to treat dependence or addiction to opioids. It prevents withdrawal symptoms caused by stopping other opioids. It is used as part of a complete treatment program for drug abuse like compliance monitoring, counseling, behavioral contact, lifestyle changes etc. Buprenorphine is usually used for the first 2 days after someone has stopped all other opioids. But it works best when the first dose is started after signs of opioid withdrawal have begun. Buprenorphine can cause withdrawal symptoms if started too soon after someone last opioid uses. Suddenly stopping this medication may cause withdrawal, if someone has used it for a long time or in high doses. To prevent withdrawal, the doctor may lower the dose slowly. So, before start taking or stop taking this medication, the prescribing doctor should be informed. It is a safe and effective medication if it is taken as the doctor has advised. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician