Just like getting a hangover from drinking alcohol, taking illegal drugs can lead to experiencing negative after-effects sometimes known as a ‘comedown’ or ‘crash’. These are the feelings experienced as the drug wears off. The type of effects experienced during this period depend on the drug(s) used. They might include feelings of depression, insomnia (inability to sleep), extreme tiredness, irritability, and anxiety just to name a few. This can last anywhere from a few hours to a day or so after initially taking the drug. It is different to withdrawal effects (a sign that a person is addicted).
People can also become physically and/or psychologically dependent on (addicted to) drugs, especially if they use regularly. They can develop tolerance, meaning that they need to take more of the drug to get the same effect.
The lifestyle of many people who are drug dependent (addicted) is hard, stressful and can lead to:
- Loss of jobs and problems finding work;
- Losing touch with friends, family, and loved ones;
- An inability to pay rent and bills, which can result in homelessness;
- Impaired physical health;
- Increased mental health problems;
- Involvement in crime.
Reduce activity in the central nervous system. Examples include: Alcohol, GHB, Ketamine, Benzodiazepines, Opioids (e.g. Heroin).
See also Drugs and their classification
Mixing drugs or taking one drug when under the influence of another drug is known as polydrug use.
To find out more, see Polydrug Use: Factsheet
People affected by psychosis may experience hallucinations (seeing or hearing things that aren’t really there), delusions (strong beliefs that do not reflect reality), and paranoia (feeling extremely suspicious and frightened). If symptoms last for more than a few days, this could indicate that the person may have a more serious mental illness such as schizophrenia.
A life threatening condition that usually starts within 24 hours of taking the drug. It occurs when the brain is overloaded with a neurotransmitter (brain chemical) called serotonin. Symptoms include coma, seizures, shaking, confusion, rigid muscles, rapid heartbeat, and overheating.
Increase the activity in the central nervous system. Examples include: Cocaine, Caffeine, MDMA (ecstasy), Methamphetamine (speed, ice, crystal, crystal meth, base), Ritalin, some new psychoactive drugs such as mephedrone and BZP.
See also Drugs and their classification and "Legal Highs": Factsheet.
People who are drug dependent, or addicted, may also experience withdrawal effects when they stop using. Withdrawal effects can last for several days to many weeks, depending on the type of drug and how dependent they are on the drug. Withdrawal symptoms may include feelings of anxiety, depression, restlessness, irritability, and aggression. On top of this, withdrawal can also cause muscle spasms, headaches, muscle cramps, diarrhoea, vomiting, and cravings for the drug.