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Hello from JustAnswer.
Actually, the Donnatal contains a barbiturate, specifically phenobarbital. So, if you had a positive result while taking this list of medicines, it would not be a false positive. It is a true positive from the Donnatal.
When someone has a legal prescription for Donnatal, there would typically not be an issue with a positive UDS for barbiturates, although documentation of the legal prescription may need to be provided.
If I can provide any additional information, please let me know.