^I feel you Dresden, I do, but are you sure no Doctor or Pharmacist, in the world, can answer it?. I'm just saying that we definitely cannot tell him that it's safe. I know we're dealing with chemicals or relative obscurity here, but unlike physicians who I find are often comically uneducated regarding the chemistry of our bodies and the pharmacokinetics of drugs, Pharmacists have actually been pretty great resources in the past. Even if they aren't familiar with the particular chemical you're taking, they could potentially make some inferences about interactions based upon how much information you're able to give them.
At any rate, the first place I would investigate would be the interactions between pharmaceutical Amphetamines and your Chemo drugs. See if there are any interactions. If not, then you can keep progressing forward.