Drug use disorders or substance use disorders are medical conditions characterised by the excessive and repeated use of one or more drugs. Drug use may start as experimentation to occasional and then heavy use. Over time, drug abuse can lead to addiction, development of tolerance to them and issues with withdrawal symptoms. Mental, physical and behavioural symptoms can manifest such as loss of control, interpersonal relationship problems and/or unsafe use. Ultimately people will become addicted to drugs if they continue to use. This means they will have a compulsion to continue using despite the negative consequences.
Treatment can include a combination of detoxification, therapy and abstinence.