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Hello from JustAnswer. I am sorry that no doctor has yet replied.
The naltrexone in the Contrave will typically not cause a false positive urine drug screen. However, even if the urine drug screen is falsely positive, which can happen in some people that are taking no medicines, the next step would be a confirmatory drug test, such as GC/MS. If you have not been taking any opiates, then the GC/MS will clearly identify that there are no opiates present.
So, there is no reason for you to be concerned in this situation.
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