Fentanyl by weight is 80 times more potent than Morphine, its analogue--Fentanyl is synthetic Morphine. This is not a drug to fool around with. It is also known as Sublimaze. Will cause amnesia, severe respiratory depression(requiring adjunct support). Mainly dispensed out of hospital setting in an impregnated patch to discourage abuse(addicts chew patches for immediate rush).

Psychosis possible with larger dosages.

To give you an idea of its potency, Fentanyl is uusually dispensed in MICRO grams as opposed to Morphine with is dispensed in MILLI grams