- Treatment with any of the following drug classes: neuroleptics, norepinephrine and dopamine reuptake inhibitors (bupropion), gabapentin, budipine, dopamine antagonist antiemetics (except domperidone), opioids, monoamine oxidase (MAO) inhibitors, catechol‑O‑methyltransferase (COMT) inhibitors, or psychostimulants (eg, amphetamines)