Substance Use and Co-Occurring Mental Disorders National Institute of Mental Health NIMH
Tolerance and withdrawal are not universal features of substance use disorder; hallucinogens, for example, do not create tolerance or withdrawal symptoms. Opioids, the class of drugs that includes heroin, are the primary driver of overdose deaths in the United States. Heroin, synthetic opioids, and prescription pain relievers like oxycodone, codeine, and morphine are designed baking …
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