Oral | Dopaminergic central nervous system (CNS) stimulants | Cocaine, amphetamine, modafinil, methylamphetamine, mazindol, methylphenidate, dexamphetamine | 7 days before scan |
Dopaminergic CNS stimulants | Phentermine, bupropion, amfebutamone | 14 days before scan |
Anticholinergic | Benzatropine | 5 days before scan |
Intravenous | Anticholinergic | Hyoscine/scopolamine | 5 days before scan |
Sympathomimetics | Phenylephrine, norepinephrine | 1 day before scan |
Anaesthetics | Ketamine | 1 day before scan |
Opioid analgesics | Pethidine | 1 day before scan |
Inhalation | Anaesthetics | Isoflurane | 1 day before scan |