Classifications	Descriptions
Criteria 1 to 4: impaired control over substance use	Consuming the substance in larger amounts and for a longer period of time than intended Persistent desire to cut down or regulate substance use; may have unsuccessfully attempted to stop in the past Spending a great deal of time obtaining or using the substance or recovering from the effects of substance use Experiencing craving, a pressing desire to use the substance
Criteria 5 to 7: social impairment	Substance use impairs ability to fulfill major obligations at work, school, or home Continued use of the substance despite it causing significant social or interpersonal problems Reduction or discontinuation of recreational, social, or occupational activities because of substance use
Criteria 8 and 9: risky use	Recurrent substance use in physically unsafe environments Persistent substance use despite knowledge that it may cause or exacerbate physical or psychological problems
Criteria 10 and 11: pharmacologic*	Tolerance: requiring increasingly higher doses of the substance to achieve the desired effect or usual dose has a reduced effect; may build tolerance to specific symptoms at different rates Withdrawal: collection of signs and symptoms that occurs when blood and tissue levels of the substance decrease; likely to seek the substance to relieve symptoms; no documented withdrawal symptoms from hallucinogens, phencyclidine (PCP), or inhalants have been reported