Thanks for this question,
Bupropion would give a false positive for ecstasy and not meth
Spironolactone does not cause a false positive for any drug
Singulair usually does not cause a false positive
Advir diskuus usually also does not cause a false positive
Similarly for the rest of them, they dont cause false positives for meth in your tests. These drugs usually dont cause false positives for meth HOWEVER many normally used OTC drugs can cause a false positive, these include drugs like ranitidine (zantac) or even drugs like brompheniramine, chlorpheniramine, ephedrine, guaifenesin, phenylephrine, pheniramine which are found in normal OTC cold and cough remedies can cause a false positive here.
Now while the above drugs dont cause a false positive in most cases, it is not impossible that they may cause a false positive reaction in your case. There have been case reports in whom drugs which normally dont cause an issue have caused a problem in rare cases. BUT the best solution here is to have your doctor run a GC/MS test on the same sample which would clear you of using meth completely. Even if you had a false positive on the screening test the GC/MS test would clearly indicate that you had a false positive and you will be cleared effectively. Another way is to have your doctor run a hair test which can effectively clear you of using the meth as well, and the doctor can run a GC/MS test on the ahir sample as well.
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