A person can also experience a psychotic episode if they suddenly stop drinking alcohol or taking drugs after using them for a long time. This is known as withdrawal.
It’s also possible to experience psychosis after drinking large amounts of alcohol or if you’re high on drugs.
Drugs known to trigger psychotic episodes include:
- amphetamine (speed)
- methamphetamine (crystal meth)
- mephedrone (MCAT or miaow)
- MDMA (ecstasy)
- LSD (acid)
- psilocybins (magic mushrooms)
In rare situations, psychosis can also occur as a side effect of some types of medicine or as a result of an overdose of that medicine.
Never stop taking a prescribed medicine unless advised to do so by a GP or another qualified healthcare professional responsible for your care.
See a GP if you’re experiencing psychotic side effects caused by medicine.
There’s been a great deal of research into how psychosis affects the brain and how changes in the brain can trigger symptoms of psychosis.