Hello and welcome to Healthcare Magic. Thanks for your query.
It is likely that the doctor is increasing your partner's dose of methadone
on the strong suspicion that your husband is continuing to take opiates. You have mentioned that his urine samples are testing positive for opiates and he had also taken dihydrocodeine (which is an opiate) recently.
The urine tests for opiates are usually quite efficient and specific in detecting drug abuse
, and it is rare to have false positives. It is also very unlikely that any herbal medication could be causing a false positive opiate test. The reason for the positive urine tests could be the dihyrocodeine or maybe, surreptitious use of other opiates. I would suggest that you discuss further management options with the team that is treating him.
Wish you all the best.
Dr. Jonas Sundarakumar