The way it was worded 'drug test' implies they were looking for 'illegal' substance use. Or it sounds that way to me (I.e they'd run a panel looking for certain specific entities, not each and every drug, legal or otherwise, which has ever been synthesized, marketed, sold or made from tree or shrub rootbark, seeds etc. and completely miss anything like say, antidiabetic agents, various obscure sedative-hypnotics, antidepressants, antihistamines, chemo drugs and the like) and just look for the likely suspects (I.e the likes of 6-monoacetylmorphine [this is IIRC what is actually looked for when testing for heroin, as it is formed as a metabolite only of that drug, at least, unless one is specifically producing 6-MAM on purpose in it's own right, and this is used to prevent the 'it was prescription morphine' or the 'poppy seed bagel' defenses being used by H users. And yes, despite what is said, apparently a single poppy seed based food item of that sort can indeed push one over the detection limit and there have been court cases over it, even kids taken away at birth from new mothers all because they had some poppy seed cake, or poppy seed bagel etc.)
Along with (N-alkyl)amphetamine, PCP, weed. methaqualone (an old sedative-hypnotic, although why they bother to test for it is beyond me, at least as part of any standard panel, since it hasn't been manufactured by big pharma in decades, still made clandestinely and of poor quality indeed if the analyses I've read are anything to go by, with substantial amounts of one of the two reagents critical to synthesis of methaqualone/quaalude, unfortunately, the toxic one. The only times it ever turns up in the west, are either ancient, though active, stashes from the medicine cabinets of dead grandma and the like, or the very occasional adventurous clandestine chemist. Putting it on any standard panel simply makes no sense, as it is just so vanishingly rare.
And the likes of cocaine, etc., mostly, with the exception of quaalude, commonly used 'illegal' drugs. That shouldn't, IMO, have gone
against you in the clinical trial, especially given yours is from a doctor. It's notable they picked amphetamine as the one
they targeted, not the much more potentially dangerous MAOI (which IMO should certainly have done so, at least, without a suitable washout period first)
Didn't say shit about your other meds, did they?