Opiates

Concern about the abuse of prescription painkillers has risen dramatically in the U.S. Of particular concern is the abuse of pain medications containing opiates (also known as narcotic analgesics), marketed under such brand names as Vicodin, OxyContin, Percocet, Demerol, and Darvon. According to the Drug Abuse Warning Network (DAWN), the incidence of emergency department (ED) visits related to narcotic analgesic abuse has been increasing in the U.S. since the mid-1990s, and more than doubled between 1994 and 2001.

Short Term Effects:
Pain relief, euphoria, drowsiness

Long Term Effects:
Respiratory depression and arrest, nausea, confusion, constipation, sedation, unconsciousness, coma, tolerance, addiction

Source:  U.S.  Department of Health and Human Services. Substance Abuse and Mental Health Services Administration.