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The difference in the Morphine and the Fentanyl is that there is nothing stronger than the Fentanyl. Fentanyl is at least 80 times stronger than Morphine. This is a decision that you will have to make for yourself.
Fentanyl is an extremely powerful analgesic, 50â100-times more potent than morphine. Its LD50 is of 3.1 mg/kg in rats and 0.03 mg/kg in monkeys. The LD50 in humans is unknown. The safety margin (LD50/lowest ED50) is ~280 [54].