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The full-text copy of the Hawk 2011 study has recently become free.

They can change the reward system, making it harder for a person to feel good without the drug and possibly leading to intense cravings, which make it hard to stop using.Each class of prescription drugs works a bit differently in the brain: Misusing any type of drug that causes changes in your mood, perceptions, and behavior can affect judgment and willingness to take risks—putting you at greater risk for HIV and other sexually transmitted diseases (STDs).Yes, more than half of the drug overdose deaths in the United States each year are caused by prescription drug misuse.When a person is addicted to a drug, finding and using that drug can begin to feel like the most important thing—more important than family, friends, school, sports, or health.Carefully following the doctor’s instructions for taking a medication can make it less likely that someone will develop dependence or addiction, because the medication is prescribed in amounts and forms that are considered appropriate for that person.