People concerned that a friend or relative is abusing prescription drugs should look for the same sort of telltale signs used to detect any drug use, Compton said. They might often slur their words, or they might not make any sense when speaking.
"If the pills in your medicine cabinet are disappearing, that's another warning sign," he said.
"The signs of drug abuse can be very subtle, and people often hide their behavior," Compton said. "It can be very advanced before you discover a person's behavior."
The U.S. National Institute on Drug Absue has more on the abuse and addiction of prescription drugs.
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