Is there a stronger painkiller than zapain?

Answer 1

Although morphine was originally touted as a cure for many maladies, even for opium addiction, by the 1870s physicians had become increasingly aware of its own addictive properties. Ironically, C.R. Alder Wright, a chemist at a London hospital who was searching for a non-addictive alternative to morphine, came up with a more potent narcotic, diacetylmorphine, in 1874. Heinrich Dreser, a chemist at Bayer Laboratories developed and tested Wright's new semi-synthetic drug on animals, humans, and most notably himself. Finding that it was a powerful painkiller and appeared effective for a variety of respiratory ailments, Bayer began producing and marketing this drug as an analgesic and a "sedative for coughs" in 1898. Because of its "heroic" ability to relieve pain, they called it heroin. Yes, heroin is about twice is strong as morphine. However, it's not a legal pain medication. Legal pain medications that are stronger than morphine include methadone and fentanyl.

There is a safe medication that is 6x stronger than morphine, its called Dilaudid. It is used to treat terminally ill cancer patients.