Quitting an antidepressant suddenly may cause withdrawal symptoms such as irritability, anxiety, insomnia, headaches, dizziness, fatigue, nausea and a return of depression symptoms.
Individuals who have taken an antidepressant drug for longer than 6 weeks are particularly at risk of withdrawal if they abruptly stop taking the drug.
Side effects of Adderall use such as heart attack, stroke, coma and even sudden death are especially likely if users have a pre-existing known or unknown health condition such as a heart defect or other serious heart problem, or are mixing the drug with other substances such as illicit drugs or alcohol.
Studies indicate that as much as half of the dopamine-producing cells in the brain can be damaged by prolonged exposure to relatively low levels of methamphetamine.