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Opiates: There are a number of post-acute withdrawal symptoms that have been reported in the weeks and months following opiate detox, including sleep disruption, anxiety, and depression, as well as decreased executive control functions.
One of the symptoms of methadone withdrawal is vomiting. There is a concern that the patient may suffocate on his or her vomit while under the anesthesia. Another concern is that the patient may wake up before the detoxification process is complete and experience the discomfort associated with detox.hen use of the drug stops, a person may experience the following methadone withdrawal symptoms: 1  Insomnia. 2  Sweating. 3  Feelings of anxiety and agitation. 4  Muscle aches. 5  Stomach cramps. 6  Nausea. 7  Vomiting.