I found another list of drugs known to cause false positives. I'm not that familiar with your specific meds (some are generic names and some are brand names), but you might look at the list: https://www.ncbi.nlm.nih.gov/pubmed/20689123
https://www.drugs.com/drug-interactions/methimazole.html
There are interactions shown. Did you test positive for meth? It is unclear.
Interactions are not the same as creating a false positive though.
I would need to know what showed in the testing, what type of test was done.