Psychedelic Drugs: LSD Changes Brain, Could be Used for Depression, Addiction TreatmentPsychedelic drugs are able to prompt brain cells in rats and flies to grow and better connect with one another. This finding further upholds the drugs’ potential use in treating a number of mental health conditions such as depression and addiction, according to a new study. The study, published online Tuesday in Cell Reports,*studied the effects of psychedelic drugs on animal brain cells both in test tubes*and in live models.