The brain registers the psilocybin in magic mushrooms as if it was the natural brain chemical serotonin, and produces its effects by disrupting normal functioning of the serotonin system.
The effects of OxyContin can last up to 12 hours, making it the longest lasting oxycodone product available.
Prescription opioids can produce drowsiness, constipation and, depending on amount taken, depressed breathing.
Much of the Ketamine which can be obtained for recreational use has been diverted from veterinarians' offices.