At this dose he would have developed some tolerance of drowsiness and confusion. He may well be suffering from chronic constipation. It may have had an impact on his liver but only a Liver Function Test can confirm this.
The more concerning issue is that he will be both physiologically and psychologically addicted to the medication. What he must not do is stop this abruptly, if he is concerned about ongoing use then he needs to speak to a doctor about cutting down his dose gradually over several months.
The other thing to consider is the initial cause of pain, has that been resolved now?
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