Final answer:
The statement about drug misuse is true, where drugs are taken for non-medical purposes or against medical advice. Drug abuse can lead to addiction and dependency, involving rehabilitation involving psychotherapy and sometimes other drugs.
Step-by-step explanation:
The statement, 'According to the textbook, drug misuse is when one takes drugs for purposes other than that for which it is medically approved' is true.
Drug abuse is the use of a drug without the advice of a medical professional and for reasons not originally intended. This can include prescription or over-the-counter medicines taken in doses that are too high or the use of illegal drugs. Consumption of drugs can be via various routes such as inhalation, injection, or ingestion, and while they can have psychoactive effects that alter mood and behavior, misuse can lead to addiction and dependency. Addiction entails the compulsive use of a substance such as a psychoactive drug despite negative consequences, while dependence involves withdrawal symptoms when usage stops.
Rehabilitation from drug addiction may involve psychotherapy and sometimes the use of other psychoactive drugs to manage withdrawal symptoms. It is important to recognize the potential for abuse and addiction when using any drug, whether legal or illegal, and to use such substances responsibly under medical supervision when necessary.