Final answer:
Drug abuse is the use of a drug without medical advice and for nonmedical reasons. It can lead to drug addiction and dependence, often necessitating rehabilitation efforts.
Step-by-step explanation:
Drug abuse refers to the use of a drug without the advice of a medical professional and for reasons not originally intended by the manufacturer. Among the choices given, the use of a drug for nonmedical reasons best describes drug abuse. This improper use can lead to drug addiction, a condition where there is a compulsive use of a substance such as a psychoactive drug despite the negative consequences that such use may entail. In many instances, this also includes prescription or over-the-counter medicines taken in doses that are too high, or the use of illegal drugs. Addiction often results in drug dependence, where physical or psychological symptoms occur if the drug use is stopped abruptly, leading to potential need for rehabilitation, which can involve psychotherapy and other treatments.
Drug abuse is the improper use of a drug for nonmedical reasons. It refers to the use of a drug without the advice of a medical professional and for reasons not originally intended. Drug abuse can be very dangerous to the body and may lead to addiction, overdose, and even death.