Magic mushrooms contain around 0.2 to 0.4 percent of the hallucinogen psilocybin, along with a trace amount of psilocin; another hallucinogenic substance.
Death is a possible consequence of barbiturate withdrawal if the condition is left untreated.
Treatment for heroin addiction typically includes medically assisted detox services to help patients withdraw from the drug safely.
The rate of drug overdose deaths in the U.S. has increased five-fold since 1990, primarily due to the non-medical use of prescription drugs.