Table 1.

Reference Drugs for PET Microdosing

Reference Drug	Main Pharmacological Target
Caffeine	Adenosine receptor
Citalopram	Serotonin transporter
Clomipramine	Serotonin transporter
Clozapine	Multiple
Diazepam	Gamma-aminobutyric acid receptor
Doxepin	Histamine H1 receptor
Morphine	Opioid receptors
Nicotine	Nicotinic acetyl choline receptor
Seligiline	Monoamine oxidase type B
Sertraline	Serotonin transporter
Sulpiride	Dopamine D2/D3 receptors
Venlafaxine	Serotonin/norepinephrine transporter
Verapamil	Calcium channel

More detailed descriptions of drug properties are provided in table 1 of the supporting information.