The effects of fentanyl are felt almost immediately and it is very effective in treating even the worst cases of pain, sometimes referred to as breakthrough pain.
Methamphetamine can be taken in a variety of ways including smoking, injecting, snorting, swallowing, or inserting the drug into the anus.
Ketamine was developed in 1963 in order to replace PCP and is currently used in human anesthesia and veterinary medicine.
Nearly 3 million Americans aged 12 or older in 2003 used prescription drugs non-medically for the first time within the past year.