Next year, doctors might finally have something new to offer people much-needed drug that can better improve their symptoms without side effects that too often cause them to stop taking their medications.
The latest round of late-stage data on a drug in development by Karuna Therapeutics, released on Monday, reinforces its potential to offer desperately needed progress for a brain disorder that affects about 1% of people in the US.
Karuna's news is a bit of a revival story. One component of the treatment, called xanomeline, has been around since the early 1990s, when scientists at Eli Lilly started exploring its use to treat the cognitive and behavioural symptoms of Alzheimer's disease and, later, schizophrenia.
Small studies suggested the drug could have a marked effect on those symptoms, but it was dropped from development because people could not tolerate its side effects. The problem was that the drug didn't act only on receptors that carry messages between nerve cells in the brain, but interacted with ones throughout the whole body, causing people who took it to get nauseated and vomit.
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