Hi, Morphine belongs to the class of medications known as opioid analgesics. After effects of sustained morphine release are nausea, vomiting, constipation, dizziness, drowsiness, mood swings, depression, tiredness, sweating, hypotension, weakness, anxiety, shortness of breath, slow and shallow breathing, tachycardia, anxiety, abnormal dreams, anorexia, hallucinations, allergic reactions, vertigo, respiratory depression, euphoric moods, physical and psychological dependency, personality changes, loss of memory etc. Subutex release contains buprenorphine which belongs to the class of medication known as opioid medication that is used to treat opioid addiction as a part treatment protocol that includes counseling and behavioral therapy. Side effects of subutex are nausea, vomiting, dizziness, drowsines, headache, drug withdrawal syndrome, fatigue, tachycardia, diarrhea, backache, toothache, anxiety, agitation, difficulty in micturition, breathing difficulties, nervousness, sore throat, depression, insomnia, loss of libido, paranoid reaction, hallucinations etc. For avoiding the withdrawal syndrome, this medication should be stopped by tapering doses gradually. Take care. Hope I have answered your questions. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician,